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Expert Answers about Wiring


  • What Ohms Should Trailer Brake Magnets Be?
  • Assuming that when you tested the resistance of the brakes you were testing the two wires on each magnet and getting 2.0 and 2.8 ohms the magnets on your trailer are not working correctly and will need to be replaced. For 7" brakes you should get 3.8-4.0 ohms, and for 10-12" brakes you should have 3.0-3.8 ohms. If the brake shoes themselves are good you can replace just the magnet using 7" # AKBRKR-M7, 10" # AKBRKR-M10, or 12" # AKBRKR-M12. If the shoes are needing replacement...
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  • Complete Flat Towing Setup For A 2020 Chevrolet Silverado 1500
  • For your 2020 Chevrolet Silverado 1500, I recommend the Deka Lead Quick-Disconnect Battery Terminal # DW05312. This will allow you to quickly disconnect the battery leads through use of a hand knob. If you're interested in what you need for a complete flat towing setup, you'll also need: -A base plate # RM-523199-5. -A tow bar # RM-676. -A braking system # DM26VR. -Tow bar wiring # RM-154. and a high low adapter # RM-058-4. You'll want to double check what kind of...
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  • Replacement Options For Bargman 30-84-013 Double Tail Light
  • We do have replacement options, though the Bargman 30-84-013 taillights have been discontinued and there's no available lenses, which means you will need to replace the light. What you can do is choose from either an incandescent or LED option, and I highly recommend the LED because they are brighter and last much, much longer than incandescent lights. The options are the following: - Bargman LED Double Tail Light # 47-84-529 - Bargman Trailer Double Tail Light - Incandescent # 30-84-527 These...
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  • How To Install a Brake Controller on 2017 Mercedes-Benz Sprinter 3500
  • You can hard-wire in a brake controller and it seems that there are not a lot of the Sprinter 3500 models that are pre-wired, at least from what I've seen in my research. I have not seen any reports that this isn't possible, and we even have an installation video to walk you through the process. The way to find out whether or not the plug is present by using a circuit tester like the # 40476 and testing for a hot wire when the brake is pressed- it's possible that one of the plugs that...
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  • How Many Sets of Electric Trailer Brakes For Tandem 3,500 lb Axles When Converting From Hydraulic
  • Excellent questions, and let's start with your query about having brakes on both axles. The answer is that you do indeed want to have brakes on both of your 3,500 lb tandem axles. The reason is because just one set of 3,500 lb brakes won't have the stopping power required for a trailer that weighs 5,000 or 6,000 lbs, and also just one set of brakes will also wear out very quickly as they'll be overworked for the load they are rated for. So for the best stopping power and safest way...
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  • 7-Way to Cigarette Lighter Adapter for Powering Air Compressor
  • Sounds like your air compressor is drawing more amperage than your adapter is rated for. A better adapter solution would be the part # 118019 which doesn't have the 10 amp restriction like your current adapter. If you check out the review video I attached for this adapter you can see our installer use it to power a similar air compressor as yours.
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  • Adding a Charge Line Circuit To a Trailer With a 4-Way/5-Way Flat Connector
  • I recommend moving away from the Adapter 4-Pole to 5-Pole Trailer Wiring Adapter # 47515 and going with a Buyers Products Trailer Connector Adapter # 337TC1474P. The wiring and connectors used on the 4-way harness are not designed to be used with the 20amps of power you will putting on the connector. The 4-way/5-way connector cannot handle the additional strain and it will likely overheat with the amperage and risk causing an electrical fire. With the Buyers Products Trailer Connector...
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  • Wiring LED Tail Lights with Four Wires
  • If the wires from your trailer are good and the power is good, then we just need to figure out what each wire on the light itself does. The best way to do that is to take a 12 volt power supply and apply that to each of the wires on your lights to see which bulb it illuminates. For example, when you use the Fusion LED Combination Tail Light Bar part # STL264RB, this has white, black, red, and yellow wires. The functions of these colors on this lights are as follows. Black: Tail White:...
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  • Wire Functions of Triple LED Trailer Tail Light CE44VR
  • While we wouldn't have any way of knowing what the 8 wires are for with your current light, I can tell you the functions of each wire for the Triple LED Trailer Tail Light # CE44VR. Then what you would need to do is match those wires with the correct ones on your RV, and you can find out what wires are for what function on your RV by using a circuit tester like the Cordless Circuit Tester # PTW2979. After that it would just be a matter of matching the wires by function (and not color),...
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  • Why Does 4-Pin Trailer Wiring Have 5 Wires
  • Your 4-pin/5-wire wiring harness is what is called a "wishbone" type which simply means that there are two separate running light wires, one brown and one pink. This allows a separate running light wire for each side of the trailer which saves you having to run a jumper wire from one side of the trailer to the other. We offer lots of wiring items just like this, such as # A35W42B, # A20WB and # A10-4225VP, which happen to use two brown wires instead of one brown and one pink. The functions...
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  • How To Determine How to Wire New Lights
  • Wire colors are not universal so the only way to determine how to wire up your lights is to use Circuit Tester # PTW2979 to find out the functions of your wires and hook up your lights accordingly. I could not find an order number for you so I can't determine which lights you purchased from us that you are looking for specific help with. For example, the LED RV Tail Light # RVSTLB61 and # RVSTLB60 have a white wire for a ground wire, a green wire for the tail light and black wire for...
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  • Parts to Convert Surge Brakes to Electric Brakes on Boat Trailer With 3,500 lb Axles
  • Thanks so much for that info, and we can get your boat trailer set up with electric brakes. Since you had an idler hub you will need a hub and drum for electric brakes, and with the bearing numbers you gave, that means you have 3,500 lb axles. That said, here is everything you'll need to make the conversion: - Trailer Hub and Drum Assembly - 3,500-lb Axles - 10" Diameter - 5 on 4-1/2 - Galvanized # AKHD-545-35-G-K - Electric Trailer Brake Kit - Self-Adjusting - 10" - Left and Right...
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  • Will the Pollak Circuit Tester Work on Newer Trucks Using LED Lights
  • While the Pollak 7-Way to RV Socket LED Circuit Tester # PK12741 is designed to work with all 7-way connectors. There have been issues with vehicles such as Audi, Mercedes-Benz, and Volkswagen that have issues due to the LED lights having such a low power draw. The newer truck models are starting to have some of those same issues since they are starting to use led lights as well, so the tester will most likely not draw enough power to work. The best way to remedy that if it happens for...
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  • Troubleshooting Thermostat That Is Reading The Wrong Air Temperature.
  • Great question, lets walk through some troubleshooting steps and figure this out. **Digital Multimeter with 42" Long Test Leads - LED Display # PT89ZR. Since we will be troubleshooting I recommend you get a multimeter like the digital one linked above. First, make sure you have the thermostat on the right setting. I know it seems obvious but sometimes we just forget to switch it over from hot to cold or vice versa. Next turn the thermostat to at least 5 degrees different than...
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  • Comparison Between 6562 & Standard 7-Way Testser
  • A standard 7-way plug-in tester like the Tekonsha 7-Way, RV-Style Tester # 6562 gives you basic functions of the 7-way, and is a great choice for doing that. The difference is the voltage and current given for the different functions with the Current Monitor with 7-Blade Connector # 6565. That is the biggest difference, along with the long cable from the 7-way so you can use the manual override to check your brake controller voltage and current at different settings. That's the difference,...
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  • Troubleshooting Trailer Brake Lights and Turn Signals Not Working After Installing 7 Way on Vehicle
  • If you've just installed a 7 way connector like the # ETBC7, you'll want to start by testing the plug on the vehicle using a circuit tester like the # PTW2979 to make sure that each pin is operating properly; you can refer to the photo attached or a helpful article that I've linked for information on testing the circuits. I would also recommend making sure that your ground wire on this harness is firmly grounded to a paint and rust free spot, as ground wires are the most common cause for...
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  • Installing Side Marker Clearance Lights with Two Wires on Trailer
  • The Bonded 4 Wire - per foot # 16-4B-1 you asked from would use the brown running light wire for your clearance/marker lights. The LED light you referenced sound like they have two wires so one will be power and the other ground. You can connect them to a battery to test which wire is power as LED lights are polarity sensitive. It is likely the yellow is power and the grey is ground which will be attached to the base frame or metal frame structure on your trailer. Often the clearance/side...
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  • Wire Gauge of USB Power Outlet for RVs - 2 USB Ports 37215115
  • 14 gauge wire is used with the USB Power Outlet for RVs - 2 USB Ports # 37215115. So you can connect the wires with two of the Butt Connector - PVC - for 16-14g Wire # DW05714. Then to mount it in the correct plate is the Mounting Plate for 12V Socket or USB Outlet # 37215155. I have added some links below to video reviews for you to check out as well.
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  • Fantastic Vent Ceiling Fan Won’t Open or Close
  • The most common problem when a fan like the MaxxFan Plus Roof Vent part # MA00-04500K will run the fan but won't open is the Replacement Rain Sensor for MaxxAir RV or Trailer Roof Vent Fans part # MA34FR . I would first attempt to clean the sensor really well and check for operation. If it works your good to go. If it doesn't use the replacement sensor listed here.
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  • How Do I Troubleshoot The Trailer Wiring Of My 2022 Toyota Highlander
  • In order to troubleshoot your 2022 Toyota Highlander wiring installation you will need some tools to assist you. You will need a 12V circuit tester. I recommend the Cordless Circuit Tester, part # PTW2979. In addition, you will also need basic wiring tools, electrical tape, a wire stripper, dielectric grease, and wiring fasteners. Troubleshooting your trailer wiring can be very intensive. This can be caused by a number of issues. If you have a plug in harness, it may be for models with...
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  • Does 12-V Trailer Connector Circuit at 7-way on 2017 Ford F350 Remain Active With Vehicle Running
  • Once the trailer is plugged in and the brake pedal is depressed, the 12-volt power circuit on the trailer connector will become active, and can be used for whatever purposes you wish. Keep in mind that this circuit can maintain a trailer battery, but it won't have the available grunt to charge a discharged battery. To fully charge the battery while the tow vehicle is running, you'll need a DC to DC charger like # 331-BCDC1240D for a 40 amp or # 331-BCDC1250D for a 50 amp charger. If you...
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  • Tekonsha Voyager XP Brake Controller Installed On A 2006 GMC Sierra 2500 Not Engaging Brakes
  • There are a few tests you can do first before you go replacing your Tekonsha Voyager XP. In your truck cab sever the blue wire several inches from back of the brake controller, and use a circuit tester # 40376 to check for power on the back of the unit when the brake pedal or the manual override is engaged. If there is power to the controller at idle, then that is indicating that there a problem with the controller and will need to be replaced. You can reconnect the blue wire...
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  • Can Junction Box be Submerged When Rewiring Boat Trailer
  • You can re-do the wiring on your boat trailer with a junction box, but a junction box cannot be submerged as they aren't waterproof. So if you are able to place the junction box in a location that allows it not to be submerged, the best option is the Trailer Wiring Junction Box # 3375601100. This comes with ring terminals and if you need wire we offer it sold by the foot with 12 Gauge # 12-1-1, 14 Gauge # DW02413-1, 16 Gauge # DW02359-1. You may also need Wire Loom # 459075-1 and...
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  • Recommended Replacement Weatherproof Junction Box/7-Way Pigtail
  • For the 7-way pigtail/junction box, I'd recommend the # 277-000141 junction box/pigtail which will do a good job of keeping the water out unless it's submerged. Adding a bead of silicone caulk around the seams where the lid meets the box and where the wires pass through would be a good idea as well. For a marker light that's 4 inches in length, 2 inches tall and 1-1/8 inch thick with mounting holes 3 inches on center, I'd recommend the # 47-59-002 LED Clearance/Marker light from Bargman....
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  • Instructions & Can Other Connectors be Used to Install the Hopkins VueSMART Backup Camera
  • For the most secure connection, when installing the VueSMART RV and Trailer Backup Camera # HM34FR, I do highly recommend using the included heat shrink butt connectors with a heat gun, the Heat Gun with Nozzles # ALL836717. However, if you'd like you can also use butt connectors that crimp such as the Butt Connectors # 05732-2. There are written directions which I've linked for you as well of the VueSMART RV and Trailer Backup Camera # HM34FR.
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  • Recommended 7 Way Trailer Wiring Harness for 2015 Jeep Wrangler Unlimited JKU
  • In order to install a 7 way connector on your 2015 Jeep Wrangler JKU I recommend using the Universal Installation Kit for Trailer Brake Controller - 7-Way RV and 4-Way Flat - 10 Gauge Wires # ETBC7L. The # ETBC7 uses the functions of your existing 4 way and comes with the wiring, butt connectors, circuit breakers and ring terminals needed to complete the installation. The good news is that because you'll be using the Tekonsha Prodigy RF # TK94FR, you won't need to run a wire for the brake...
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  • Replacement 4-Way Trailer Wiring Connector for 2004 Ford Ranger
  • The easiest and best solution we have to give you a 4-way harness on your 2004 Ford Ranger is with the Hopkins kit part # HM40655. This plugs inline with the taillights of the truck and gives you a 4-way that will work great and won't trigger any anti-theft systems like you mentioned.
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  • Which Fuse In 2013 Ford F-150 Controls Trailer Turn Signals?
  • Since the trailer connector on your 2013 Ford F-150 is no longer sending power to the turn signal circuits on your trailer you will need to replace fuse # 73. This 20 amp fuse is located in the engine bay fuse box and is what sends power to the trailer turn signals and is what would have blown when you accidently shorted the trailer turn signals. You will want to use a circuit tester like # 40376 to test each side of the fuse to verify if power is making it through or not as some times...
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  • Will the 1/2 Inch Metal Loom Clamps Work On a 5/16 Inch Frame Rail
  • Yes, the Metal Loom Clamp part # A0500 will work on a trailer frame that is 5/16" thick. The Metal Loom Clamp will actually work on pretty much any frame thickness but you will need to make note of the size screw used. I recommend the Hex Screw part # 101131802 for a 5/16" thick frame as it is 1/2" long. The Wire Loom part # 459075 can then be added to protect your wiring. I have attached a list of our other wiring accessories for you below as well.
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  • What Color Trailer Wires go to the Red, Black and White Taillight Wires
  • This is a common question we get on lights like the LED Trailer Tail Light with License Bracket part # 328-003-81LBM1. The original colors you have are the traditional trailer wiring code so brown=taillights, red=turn/brake and white is ground. On your new light black=taillights, red=turn/brake and white=ground. You will connect brown to black, yellow to red and white to ground.
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  • Is Jacketed 2 Wire Resistant to Salt Water
  • The wire that comes with the Jacketed 2 Wire (Brake Wire) - 12 Gauge # 12-2-1 is not tinned but you could tin the ends where you're making your connections if you choose to do so. This wire is also resistant to corrosion from water in general - it doesn't have a special rating for salt water. It is perfectly fine to use on a boat that is being used to offload a boat into the ocean. Some actions you can take to help extend the life of your wiring (and trailer in general) are to use...
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  • Determining Axle Length for 73 Inch Outside to Outside Frame Trailer
  • Assuming you have an existing axle, the best way to determine the axle you need is by measuring from hub face to hub face. Once you have this measurement you can measure from the center of the leaf spring to the center of the other leaf spring to make sure there is a compatible replacement. If you do not have an existing axle you will need to take in to account the width of the tires and wheels you intend to use as well as the spindle length. Start with the width of your trailer with...
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  • MaxxAir Fan Troubleshooting
  • On the MaxxFan website it says, "Yes, the MAXXFAN and MAXXFAN Plus are designed with dual lifting arms to fully support the lid if installed properly. This makes the lid very sturdy and able to withstand high driving speeds when left open, it also prevents the lid from vibrating and rattling during high winds when the RV is parked. Be sure to fully open the lid when driving so the dual lift arms provide the maximum support for the lid." I would take down the bug screen from the inside...
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  • Does Optronics LED MCL0040RBB Need to be Replaced if Broken
  • If your light is cracked, you will need to replace the fixture with the Optronics LED Clearance or Side Marker Trailer Light w/ Reflector - 1 Diode - Round - Red Lens # MCL0040RBB. Should you also need butt connectors to attach the wiring you can use the Deka Heat Shrink Butt Connectors # DW05744-5.
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  • Plug-In Location For 4-Way Wiring Harness on 2022 Subaru Outback
  • Yes, the 2022 Subaru Outback - including the Premium - does have a location to plug in the 4-way. It is under the rear threshold plate in the cargo area, near the passenger side. I have added a photo for you showing the location, and you can get to it easily by using Trim Pad Remover # ALL648544. The correct 4-way wiring harness for your 2022 Subaru Outback is the following: - T-One Vehicle Wiring Harness with 4-Pole Flat Trailer Connector # 118467
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  • Why Is My Brake Controller Displaying Trailer Not Connected When A Trailer Is Connected?
  • There could be a couple of reasons why your brake controller is displaying that the trailer is disconnected when the trailer is connected. What I would first check is the vehicle and trailer side connectors for any dirt or corrosion as this is a fairly common reason why things malfunction. If you see any dirt or corrosion, clean out the connectors, and recheck your brake controller for proper functionality. If your connectors are clean, or you just cleaned them and rechecked, and...
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  • Parts Needed to Install 7-Way and Brake Controller in 1981 Chevy Truck
  • For 7-way wiring you could run from the cab of your truck back to the rear of it we have the jacketed 7-way wiring part # DW04914-1. We don't normally offer wiring for this portion of a vehicle but this would work if you have the 7-way wires present near the cab. Normally in this situation we recommend installing a 4-way like the # 119190KIT which wires to taillight circuits and then converting to a 7-way with the # ETBC7 like you referenced so that you can install a brake controller...
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  • Converter For Motorcycle/Trike With 6-WAy Separate Lighting & Trailer With Combined Lighting
  • Ok, we can help you out here to get all of the functions working; there isn't an adapter available that is going to do this since your trike has separate lighting and your camper trailer has combined. What you will need is a converter for your trike, and you'll need to cut off the 6-way and wire in a 4-way; here are the parts: - Roadmaster Brite-Lite Wiring Converter # RM-732 - 4-Pole 60" Long Vehicle End # 18002 - Cordless Circuit Tester # PTW2979 You'll need the circuit tester...
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  • Does Tekonsha Trailer Wiring Circuit Tester Activate Trailer Brakes
  • The Tekonsha Trailer Wiring Circuit Tester # 8010 does send power back to your trailer brakes to make sure the circuit is working correctly. This will apply your trailer brakes at short intervals and will let you know the condition of your wiring. This means that the tester essentially tells you whether or not your brakes are working, however if something is wrong with them mechanically (as in they need to be replaced because or wear) that will need to be determined by physically inspecting...
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  • Reverse Light & Wiring For Boat Trailer
  • So in order to add a reverse light to your boat trailer, all you need to do is connect the wiring from your junction box or 7-way directly to the reverse light's wires. For reverse lights, if you don't already have wiring at the junction box or your 7-way, what you can do is add 14 Gauge Primary Wire - Blue - per Foot # DW02414-1. Then you will simply run that wire to the reverse lights, which you can connect with butt connectors. The exact parts you will need to do this are the following: -...
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  • Is There a Factory Brake Controller Tester Device
  • The Current Monitor with 7-Blade Connector part # 6565 is what we use in our shop when testing trailer brake controllers. It has brake magnets inside so there won't be any issues with trying to trick the vehicle into thinking a trailers is connected. It will read the voltage being sent to the trailer brakes. It also test the lights and battery charge line circuit. The other option which simply lets you know voltage is being sent, not how much is the Tekonsha 7-Way, RV-Style Tester for...
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  • Troubleshooting Brand New Trailer with Weak Electric Brakes
  • Since the trailer is brand new most likely the issue is that the brake assemblies aren't adjusted properly as this is the most common cause for weak brakes on a new trailer. If the assemblies are self-adjusting they will get tighter with every application of the brakes so you can apply the manual override lever several times and they will get tighter each time. Or you can manually adjust them tighter to get them more sensitive. I have attached a great installation video that you...
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  • Troubleshooting 2002 F-250 Towing Horse Trailer with Working Exterior Lights but No Interior Lights
  • It sounds like the interior lights on your trailer are powered through the 12 volt circuit on your Ford's 7-way. So, start by testing to make sure that pin is active. On a standard RV style 7-way, this is located at the 1 o'clock position. I've attached a diagram for visual reference. Using a tester like # PK12741 would be the easiest. You could also simply have a case of corrosion on/in the connectors that is preventing the +12V auxiliary power from reaching the trailer. If this is...
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  • What Are The Standard Colors And Functions For A 4 Flat On A Cargo Trailer
  • The standard 4 Flat will have the White (ground), Brown (running lights), Yellow (left turn and brake), and Green (right turn and brake). Black will typically be used for 12 volt power, but can also be any number of things. The only way to know for sure what it is used for will be to trace it to its source. However, if you only need the 4 standard functions, you can definitely just cap that off and use something like the Hopkins 4 Flat # HM38168. With that said, if you do trace it and...
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  • Adding Charge Line To a 2021 Kia Telluride With Factory 7-Way
  • Yes, you can run a Wire # 10-1-1 from your battery on your 2021 Kia Telluride directly to the auxiliary/charge line on your factory 7-way. I do recommend using a 30 amp. In-Line Circuit Breaker # 38630 to prevent power from overloading the wiring. Since it is a factory installed 7-way you may want to check the fuses on your Telluride to ensure they are good and were not left out from the factory. Your owners manual indicates that there are three 30 amp fuses listed directly for the...
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  • Will Trailer Brakes Lock Up when Connected to 2003 BMW X3 that Does Not have a Brake Controller
  • The brakes on the trailer will not lock up. they actually won't do anything at all (unless something was miswired). To activate the brakes you would need to have a brake controller. Without one the brakes will not function. Because of how the wiring works on a BMW the recommend brake controller for the 2003 X5 with factory 7-Way is actually the Prodigy RF # TK94FR which mounts to the trailer. If you do want the brakes to function in the future, which I do recommend as it will be much...
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  • Which Wire Sized Should be Used for Electric Trailer Brakes
  • You should use 10 gauge wire for electric brakes which is pretty much the standard size for electric braking applications because it can handle the amperage better over the long distance from a brake controller to the electric brakes. For a nice duplex cable with two 10 gauge wires you can use # 10-2-1 which is sold by the foot. I have also included a link to our help article on adding electric drum brakes to a trailer.
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  • Creating a Hot Lead from RV to Towed-Trailer Battery
  • You should use 10 gauge wire, item # 10-1-1, and a 40 amp inline circuit breaker, item # PK54540, to install the hot wire in the 6-way connector at the rear of your RV. Using a fuse on the trailer side while not required, would protect your RV form any problems associated with this wire or the battery on the trailer side.
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  • Weak Trailer Brakes On Trailer Towed by Ram 3500 or Chevy 2500
  • Which brake controller are you using? What are the years of the trucks? If using factory integrated brake controllers you may need to adjust the gain (same on aftermarket controllers) to increase the output voltage. Trailer brakes work on varying voltages. At 4 to 5 volts that is not quite half of full power. At 12 volts the magnets would be fully energized. Also, where are you testing for voltage? Adjust the power output on the brake controller to the maximum and then have someone fully...
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  • Can 12 Volt Power Be Run With a 4 Flat Trailer Plug?
  • Typically a 4 Flat plug will not have a lead that goes to a battery as the White wire is the Ground, The Yellow is Left Turn/Brake, Green in Right Turn/Brake, and Brown is Running Lights. If you were using this for a different application, you can technically use any of the wires to run to the battery, but I do recommend using the White as the Ground as this is the standard. If you are using this as trailer wiring, I recommend going a different way. The Deka Jacketed 6-Wire # DW04906-1...
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  • How to Add 7-Way Wiring to Rear of Flagstaff 5th Wheel to Allow Towing Boat Trailer
  • The 4-pole format of trailer wiring includes only basic lighting signals for stop, tail and turn lights; in order to have trailer brake power you will need to convert the wiring to at least a 5-pole (one more circuit for brakes) or to the popular 7-way format which has circuits for brakes, reverse lights and auxiliary 12V power. An article on wiring is linked for you and this includes details about the circuits found on each type of wiring format. If the taillight wiring in your Flagstaff...
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  • How to Test a 7-Way Trailer Connector on a Tow Vehicle
  • Yes, in order to test the trailer connector on your tow vehicle you can use a standard circuit tester or a plug in tester like the 7 Way Trailer Connector Vehicle Tester part # TR20117. This is going to make testing the wiring on your tow vehicle simple. All you need to do is plug the tester into the trailer connector and then activate the signal while checking for the red light on the tester. If the red light appears you know that circuit is active but if not then you know there is an...
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  • Trailer Lights Blowing Fuse When Running Lights Are Activated
  • This sounds like you have a short circuit somewhere in your wiring. The first thing you'll want to do is, disconnect the trailer from the tow vehicle. Next, switch out the blown fuse with a new fuse and use a circuit tester like # PTW2992 to test the vehicle side connector while you test the running lights. If your circuit tester shows power and the fuse does not blow, then the issue is with your trailer. If it does blow a fuse, your issue is with the vehicle. If this is the case, you'll...
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  • Finding Brake Switch Output Cold Side for Electric Brake Controller on 2010 Jeep Wrangler Unlimited
  • The cold side of the brake switch is located behind your brake pedal. You will need to use a circuit tester like # PTW2993 to test the wires to the switch. There will be a constant power 12v that will come into the switch and the wire you are seeking is one that has no signal when the brake pedal is not pressed, but has the signal when the pedal is pressed. So it is cold (not showing power) when the pedal is up and is hot (showing power) when the pedal is pressed. I've attached...
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  • How to Bypass 12 Volt Trailer Wiring Accessory Circuit Not Functioning on New Ford Truck
  • It would not as it's only really designed to see if voltage is present. The new Ford trucks need a specific amount of load on the circuits to activate the 12 volt circuit which is pretty annoying. If you are looking for a way to bypass that let me know as we can help.
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  • Options for Repairing or Replacing Damaged Electric Drum Brake Magnet Leads
  • You may be able to repair/replace the damaged magnet wire from your trailer's electric brake if you can get access to it. You may have to remove the wheel and hub to get access to the magnet wires to allow you to splice in a length of new 10-gauge wire like # 10-1-1 using a butt connector like # 05732-2. Another option is using Liquid Electrical Tape # SWC50122 but new wire is the better long-term fix. Another option is replacing the entire magnet, which will include new wire leads....
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  • Locating Brake Switch Wire on 2016 Mazda CX-9
  • To locate the correct brake switch wire on your 2016 Mazda CX-9, you will need to use a circuit tester like # PTW2993 to test each of the 3 wires you mentioned in your question. You are looking for the wire that shows power only when the brake pedal is depressed and not for any other function like turn signals or running lights. I was not able to locate what color this wire might be in your Mazda CX-9, however testing the wires is still the best method as vehicle manufacturers tend to...
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  • Availability of Waterproof Connector for Side Marker Light Wiring on Boat Trailer
  • In order to splice into the wire and add yellow side marker lights like the # MCL13A2B I recommend using the Self-Stripping Connector with Waterproof Sealant # SWC501746-1. This is designed to make a quick connection without cutting or stripping, and uses a waterproof sealant to help prevent corrosion. It is designed for marine use. I would also recommend wrapping the connection in electrical tape for extra protection.
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  • LED Red Marker Lights That are Made in the USA
  • We do have some red LED clearance lights that are made in the USA. They are made by Command Electronics, and I was able to confirm with the manufacturer that the following lights are in fact made in the USA: - LED Trailer Clearance or Side Marker Light with Reflex Reflector - 2 Diodes - Red Lens # 328-K-59LB - Hot Dot LED Trailer Clearance and Side Marker Light - 2 Diodes - Red Lens # 328-003-17R Both of these lights are surface mounted and have 2-wire leads, with the red wire...
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  • Can I Use the Tekonsha 7 Way Plug Tester with a Redarc Tow Pro Liberty Brake Controller
  • Yes. The Tekonsha 7-Way, RV-Style Tester for Brake Controllers - LED Test Lights # 6562 will plug into a 7 way trailer plug on your 2015 Toyota Highlander and allow you to test the function of a Redarc Tow Pro Liberty # RED24FR without any issues.
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  • Is the Quick Disconnect SWC60010-1 A Male or Female Connector
  • The part # SWC60010-1. These do not have a male and female designation. If you ordered a quantity of two of these they would be able to connect to each other.
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  • No Power to 7-Way Trailer Connector on a 2004 Ford F-150
  • It sounds like a possible tow package fuse has blown on your 2004 Ford F-150. You will want to use the truck owners manual to find the locations of all fuses/relays associated with the tow package wiring to check them. The 12 volt pin on a 7-Way does not affect the regular trailer lights and the fact that everything stopped working with the interior lights is what makes me think the issue is related to the tow package fuses (specifically the one that controls the 12 volt circuit on the...
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  • Trailer Wiring Harness Recommendation for a 2007 Chevy Colorado
  • Actually to install a 4-way in your 2007 Chevy Colorado all you would need is the part # 118301 that plugs right in to factory wiring on your truck. There would be no need to hardwire anything at all. Also, since your truck has separate turn signals from brake lights you couldn't just hardwire a 4-way to the wiring anyway so the # 118301 would be your best option. I attached an install video for you to check out as well.
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  • How to Order 20 Feet of 10 Gauge Jacketed Dual Wire
  • Since you want 20 feet of jacketed 10 gauge wire with two wires in it you'd actually want to order a quantity of 20 of the part # 10-2-1 which is two 10 gauge wires jacketed together sold by the foot. Basically whatever quantity of this you order you'll receive in total feet without any cuts.
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  • Battery Disconnect Solution for Flat Towing a 2015 GMC Yukon Denali XL
  • Instead of having to disconnect the negative battery terminal every time you flat tow your 2015 GMC Yukon Denali you could just use a # DW05312 to make the process simpler. No tools or anything would be needed to disconnect the battery, I attached an install video for you to check out as well. Another option which makes disconnecting the battery even easier is part # RM-766. It gives you the ability to disconnect the battery just by flipping a switch. I also attached an FAQ on flat...
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  • Trailer Wiring Circuit Tester Comparison
  • Both the Tekonsha Trailer Wiring Circuit Tester # 8010 and the Hopkins Tow Doctor Trailer End Test Unit # HM50928 are for testing the wiring of your trailer. Both will work with incandescent and LED lights. However, the Hopkins will not display amperage for LED lights. They both connect the same by plugging your trailer's wiring harness into the unit. The Hopkins includes connectors for a 7-blade, a 4-pole, and 6-pole round. The Tekonsha has the 7-blade standard. If you need a...
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  • Electric Brakes Not Working when with Factory Brake Controller on 2013 Silverado and 2014 Yukon
  • Since we know that the trailer brakes do work since they work with your 2011 Ford F-150, the issue must be with the factory brake controllers in the 2013 Silverado and 2014 GMC Yukon XL Denali. The fact that they are GM vehicles is a clue. Sometimes, for whatever reason, GM will not make the tow package fully functional at the factory. You would have to make some connections under the hood. Even though I have not heard of this being an issue on models with factory installed brake controllers,...
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  • How to Test Brake Magnets on a Dexter 7,000 Lb Axle
  • I have attached a help article that will walk you through step by step the various processes to troubleshoot brake magnets. In order to perform these tasks you are going to need a multimeter like part # PT89ZR instead of a test light like part # 40376. Then depending on where the problem originates, you can use part # 10-1-1 if you need to replace any of the wires and part # BP01-225 if you need to replace any of the magnets.
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  • Troubleshooting Fuse Blowing and Wiring Heating Up for Left Side Lights on Trailer
  • It is likely that you have a short in the wiring. Although, it is always a good idea to check your other ground connections. Since it is a new wiring harness that is probably not the problem. Start by checking your 7-way using a circuit tester like the # PTW2993. It would also be a good idea to clean your 7-way connections while you're at it since corrosion and debris can cause problems. If everything checks out for the left side lights then it is a problem on the trailer. If it...
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  • Availability of Black and White 16 Gauge Wire
  • In 16 gauge wire we only carry two colors by the foot. We have the black wire part # 16-1-1 or we have the white part # DW02359-1. In 10 gauge we only have the wire in red like part # DW02508-1 or blue like part # 10-1-1 but I think what you'd really be best served with is the 7-way upgrade kit part # e99011 which comes with a 7-way and junction box and then for the wiring to run from the box to the trailer wiring you'd want the # DW04914-1 which is sold by the foot and uses the standard...
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  • Trailer Brakes Lock Up When Trailer Connected with 2016 Nissan Frontier
  • It sounds like the brake output (blue) wire and the 12 volt power (black) wire have been switched. This is a pretty common problem on Nissan's so much so that we have an entire help article on the issue which I have attached for you. The fix is very easy though, all you need to do is switch the blue and black wires at the back of the trailer connector. In order to do this I recommending the Deka Heat Shrink Butt Connectors part # DW05745-5.
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  • Is There a Tester for Trailer Side 7-Way
  • There is a tester for a trailer side 7-way (the standard blade-style, which is what I think you were referring to by flat 7-pin tester), though not a tester that you can plug in between your vehicle 7-way and trailer side 7-way; you would need to get two separate testers, one for each. For the trailer side tester, the only option is the Tekonsha Trailer Wiring Circuit Tester # 8010. This is a comprehensive tester and all you have to do is plug your trailer's standard 7-way into it...
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  • Easy Options to Keep Trailer Battery Topped Off While being Towed Throughout Day
  • Running 10 gauge wire like part # 10-1-1 from the 12 volt accessory pin of your trailer wiring to the battery's positive post is a great way to give it a maintenance charge while you are driving around. It won't charge a dead battery back to life but it will keep a battery topped off that's had moderate use. Or we have roof top RV solar panel kits like part # 34272635 which will give you a way to keep the battery topped off as well as it can provide up to a 100 watt charge. I attached...
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  • Should Only Driver's Side Trailer Brakes be Connected to Brake Controller Circuit
  • Just to be clear you are saying that only the brakes on the driver's side of your trailer are connected to the wiring for your brake controller? That shouldn't be the case at all as the braking on one side will cause that side to pull on your tow vehicle so at higher speeds your trailer will turn a bit when braking. Double check the brakes on the right side of your trailer to see if they are actually connected to the brake controller circuit. You actually should be able to hear the brakes...
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  • Tekonsha TR20117 or 6562 7-Way Trailer Connector Tester for 2017 Ford F-350
  • You would need to go with the # TR20117 because your vehicle was manufactured after 2013. I believe the factory brake controllers in the later model Ford trucks were proportional, which means that you won't get any output on the brake pin when the vehicle isn't in motion, only when the manual brake switch on the controller is activated. The easiest way to test the wiring on the trailer is to use a 12 volt battery, ground the negative terminal to the trailer frame and apply voltage to...
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  • Brake Controller Not Getting Power on a 2010 Ford E350 Van
  • The first place that I recommend checking when you lose power to something would be your fuse box. A blown fuse can cause the power to not reach your brake controller. If your fuses look okay then it might be easier to find a wire that is connected to your battery and trace it back to your brake controller. If you can find the right wire this way, then you can check for any signs of corrosion, exposed, or damaged wiring. As for the connector in the picture that you sent, there are no...
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  • Installing an Electric Trailer Brake Controller in a Class A Motorhome with Air Brakes
  • From my research your 2007 Fleetwood Revolution LE 40e motorhome has air brakes. However, you can still use an electric brake controller. To install the controller you'll need to wire it into your RV. The black wire connects to the positive post of the battery, the white to ground, the blue wire to the RV's trailer connector in the rear, and the red wire connects to the stop light switch. To find the correct stop light switch wire use a tester, like part # 40376, and find the circuit...
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  • What Wire Gauge Should be Used for Electric Trailer Brakes?
  • It would be fine to use either 12 gauge wire # 12-2-1 or 10 gauge wire # 10-1-1. However, we generally recommend using the 10 gauge wire for running the 12V power to your electric brake to avoid the wire potentially overheating.
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  • Interior Lights Not Working on a 1998 Sooner Horse Trailer
  • If all of the other functions on your trailer are working correctly, then you most likely have a short or a bad ground on the wiring that your interior lights are connected to. You can trace it all the way to the trailer connector on your horse trailer and look for any places where the wire might be bent, damaged, corroded, or exposed and replace it or fix it. Another way to test and see if that is the problem is to test the pin on your tow vehicle side connector that is used for 12V...
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  • Circuit Tester for 7-Way Trailer Connector that Includes All Circuits
  • The 7-way circuit tester part # 6562 tests all of the 7-way circuits including the two you mentioned of brake output and 12 volt accessory. I attached a review video for this for you to check out as well.
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  • No 12 Volt Power at 7-Way Trailer Connector on a 2018 Ford F-350
  • In order for the 12 volt circuit on the 7-way in your 2018 Ford F-350 to receive power, you will need to activate this in the information center on your dash. Please note that once this is done the 12 volt circuit on the 7-way will still not show power until the trailer is connected. Now with that being said, there is not a direct correlation between the 12 volt circuit on the vehicle's 7-way and the landing gear legs on your 5th wheel trailer. The 12 volt circuit on the 7-way would...
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  • Troubleshoting 2013 GMC Sierra 3500 Brake Controller Not Working with Brake Pedal
  • Most likely you have an issue with the stoplight circuit of your 2013 GMC Sierra not able to tell the brake controller that the brakes are being applied. For your generation of truck this is commonly due to the third brake light or CHMSL fuse being blown. You can check this quickly by pressing the brakes and seeing if the third brake light comes on.
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  • Why Aren't The Interior Lights On My 2014 ATC Enclosed Trailer Working?
  • If all the other lights on your 2014 ATC enclosed trailer are working when plugged into your truck, you either have a bad ground or a break in the wiring somewhere. The ground issue will require you to make sure all your grounds are good and solid. I would also make sure they are not "stacked" with other grounds. This is a fairly common practice, but it is always best to have each ground on its own. If all those look good and or it doesn't get everything working, yo do have a break somewhere...
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  • Installing a 7-Way Trailer Connector on a 1998 GMC Pickup
  • We have put together a kit that includes all the parts you will need to set up the rear wiring for a 7-Way and prepare the truck to install a brake controller. The kit is part # ETBC7. It will utilize the 4-Way that is already installed and then you will run the included length of 2-Wire up to the front to connect to the brake controller and the the battery for 12V power using the blue and black leads. The purple lead is for reverse lights, if needed, and the white is for ground. I have...
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  • Finding Brake Light Wire On 2011 Volkswagen Golf When Installing Brake Controller
  • Some vehicles do make it tough to simply wire into the brake light switch for the brake controller and your Golf may be one of those, but I do have a solution for you. I called my contact at Tekonsha and they told me that you will want to find the wire that leads to the third brake light. Use a tester like part # 40376 and find the wire that only shows power when the brake pedal is pressed. You would then attach the red wire from the brake controller to that wire. Although they were...
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  • Can You Wire A Rear Light Bar To Your Tail Lights
  • Yes you can run it to your tail light or splice in to the tail light. Depending on the gauge you can use the Quick Splices - Self-Stripping Connector - Closed Port - 14-16-18 Gauge - Blue - Qty 1 # SWC502905-1.
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  • Fifth Wheel Trailer Brakes Not Braking Enough with Controller Turned Up All the Way
  • Ideally, the trailer brakes would be braking in such as way as you cannot tell they are braking but I do not think that is the issue here. It sounds like there may be some voltage loss somewhere. With the controller output set up correctly and the brakes adjusted, you can check a few other things to determine where the problem is. Start by severing the blue wiring from the back of the controller a few inches. Use a circuit tester like # 40376 if needed to test the end coming from the...
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  • Electric Brake Controller Installation on a 2017 Cutaway Chevrolet 4500 RV
  • We haven't had the chance to install a brake controller on a 2017 Chevy 4500 Cutaway but it's very likely to be the same. The first difference I would be careful of though is the wiring coloring. Before assuming the wire color is all the same use a circuit tester, like part # 40376, to test each wire you find for function. Vehicle manufacturers aren't very consitent on wire colors; especially from year to year. If you need other components, like a trailer hitch or 7-way connector...
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  • Troubleshooting Weak Trailer Braking and Low Voltage at Connector
  • With the brake controller set to its maximum setting, you should be getting 12 volts at the trailer connector when applying the manual lever. Since you are only getting 8.5 volts at the connector, the issue you are having is likely somewhere on the vehicle side. Start by tracing the wiring back from the 7-Way connector and along your tow vehicle, checking for any damaged or corroded sections, fixing as needed. If all the wiring looks okay, I next recommend checking the brake controller...
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  • How To Fix Power Wire On Voyager WiSight Backup Camera That Was Cut
  • Thanks for the picture! Based on the picture you sent in you may have enough room to use heat shrink butt connectors # DW05743-5 to reconnect the cut wires. There should be one black wire, and one red wire. You will need to strip back the jacket on the wires, reconnect them using the # DW05743-5, and then can use black electric tape # PP47FR to cover the connections to make it blend in. If there is not enough wire sticking out of the back of the camera to use a butt connector you...
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  • Trailer Brake Controller Recommendation for 2008 Monaco Camelot Motorhome on Roadmaster Chassis
  • We don't have a schematic for the 2008 Monaco Camelot 40 foot, so I can't tell you where that wire is connected. I recommend looking under your dash and using a circuit tester like # PTW2993 to test. You can connect a battery to the 5 o'clock pin of your 7-way and then test for that 12V on wires under your dash. Confirm the correct fit by unplugging battery connection and testing again to confirm no power on that wire. Once you have found the correct wire, you can install your Prodigy...
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  • How To Install A Brake Controller on a 2009 Ford F-150
  • Installing a brake controller system on a 2009 Ford F-150 is very simple thanks to the brake controller port they provide. The port is in a funny location but you simply plug in the brake controller and you are done. The most popular brake controller we carry is the Tekonsha Prodigy. For a Prodigy for your truck, you would use part # 90185 and adapter # 22292 and it will include a wiring harness that will allow you to simply plug the controller into the truck. No cutting, splicing or...
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  • How to Use Circuit Tester and Multimeter to Confirm Lighting Functions on Vehicle Wiring
  • Trailer wire colors sometimes follow a color code but there is never a guarantee that this is done all the time. When a vehicle assembly line runs out of one wire color, they do not stop production - they change wire colors! More often than not, a white wire is ground, but there is no way to actually look this up reliably for your Lancer. So the best way to figure out the correct wiring for installing an item like an aftermarket spoiler with built-in lighting functions is to test the...
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  • Troubleshooting Right Turn Signal Flashing Twice as Fast As Other After Harness Installation
  • The Curt T-Connector Vehicle Wiring Harness with 4-Pole Flat Trailer Connector # C56272 should not have changed the speed of your turn signal, so I recommend using a circuit tester like # PTW2993 to test the wires. Next I recommend checking the connections for bent pins and using a little dielectric grease # 11755 on the connections to give you a connection free of debris and moisture. Then doublecheck the ground connection on the harness. Make sure the connection is bare metal to...
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  • Replacement Parts for a Fan-Tastic Vent Fan 6600R
  • I called my contact at Fan-Tastic Vent and they informed me that there are no longer any replacement parts available for the Fan-Tastic Vent Fan 6600R due to its age. I would first check to make sure none of the wires are pinched and that the lift motor is receiving power by probing the wires with a circuit tester like part # 40376. If it turns out that it is not a pinched wire and the motor is bad then you will need to replace the entire unit. For a direct replacement, I recommend the...
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  • Electric Trailer Brakes Affecting Lights on Trailer
  • That is truly bizarre and not something myself or others I consulted with here have ever heard of happening. So please keep that in mind but there are some issues that may be causing this to look out for. If other trailers work fine with your truck the issue has to be with the wiring on this specific trailer. First, the most basic thing to do is check your trailer connector for corrosion if you haven't; it could be causing issues with the signals getting mixed or circuits crossing, and...
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  • Is the Center Pin on a 7-Way Trailer Connector for Reverse Lights
  • On most vehicles the center pin on a 7-Way trailer connector is indeed for reverse lights. Sometimes it can be an auxiliary 12 volt source (in addition to the 12 volt that is already there) but this is not all that common. You can test it by using a circuit tester such as # 40376. Chock the wheels, have someone sit in the vehicle with the emergency brake on, their foot on the brake, and then put the vehicle in reverse while you test the center pin. If it lights up the tester when the...
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  • Where Is Fuse Located For Trailer 12V Power For 2004 Chevrolet Silverado
  • I have attached a drawing that shows how the 7-way wiring should be run. As the drawing shows, the Black 12V wire coming from the back of the trailer connector is run to the positive battery post with a 40 amp circuit breaker. Another way to attach the Black wire is to attach it to the forward-most positive terminal on the fuse block. If you attach the wire to the fuse block you will also need to use a 40 amp fuse in the slot closest to the terminal. I did some research of the fuse...
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  • How To Find The Correct Brake Signal Wire When Installing A Brake Controller
  • It sounds to me like you are not splicing into the correct stop light circuit. The correct stop light wire you will need to attach the red wire from the brake controller to on your 2017 GMC Acadia is white. To test this, you will want to use a circuit tester like part # 40376. The first thing you will need to do is attach the circuit tester to the correct white wire located behind the driver side kick panel. Once attached, depress the brake pedal and the circuit tester should illuminate....
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  • Troubleshooting 5th Wheel Wire In Junction Box That Isnt Connected And Error Message
  • On your 2014 Open Range 5th wheel trailer, the color of wire unfortunately doesn't help. You will need to test the wire for function. Because you have the lighting functions, you may have a ground or reverse function. You may also have a brake that is not fully functional. I recommend tracing that wire and using a circuit tester like # PTW2993 to determine the function. I recommend connecting that single wire to a battery to see if you can quickly determine function.
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