Sue
10/24/2024
I have replaced tail lights on a trailer and have what appears to be a ground issue and I’m stuck in my retrofit. When the running lights are on, all lights work on high (braking illumination), when I use the turn signals the appropriate side (L/R) responds but blinks in opposite time from the tow vehicle blinkers. When I step on the brake the lights go out. Can anyone see an obvious issue here? What am I missing? I have a two horse bumper pull trailer that had the pre-LED era 4” round lights as the only rear indicator lights. After nearly getting rear ended with horses in the trailer I am replacing the rounds with 4” LEDs and adding a strip light to each side as well for added visibility. Help appreciated!
Jerred H.
10/24/2024
Lori
10/15/2024
I would appreciate any guidance. We have a 2023 Riverstone 39RKFB. The back right-side markers are on and we are plugged into shore power. We have cleaned the 7 pin plug (it's dry with no corrosion) and disconnected shore power and battery but nothing works. Can you recommend a solution?
Kevin C.
9/30/2024
Lou
9/30/2024
Kevin C.
9/30/2024
John B.
11/25/2024
Kevin C.
11/25/2024
Isaac H.
9/26/2024
2012 Sonoma 20 ft Trailer My brakes do not release while trailer is hooked up either by battery or towing vehicle. If I unplug everything including battery breaks release Cannot figure out what my issue is?
Jameson C.
9/26/2024
John B.
11/25/2024
Jameson C.
11/25/2024
Mike S.
9/22/2024
I have a new boat trailer with a 7 pin. I have no brake lights. I had brake lights etc when I first got it 1 month ago. I found many bad slices and worn wires on the trailer. I started with a new 7 Pin retired with new wire from front to back. All other functions work. Both turn lights work. I then figured out the there is no power/signal to the plug on the truck side. Yet there is still turn signal there. They are supposed to be on the same circuit. I replaced the truck receptacle thinking that was the culprit. No luck.. I have checked the 2 fuses under the hood labeled turn/brake. Both 10 amp fuses were fine on the ohm meter. Truck is 1999 Silverado I have had since new. I have not spliced up any of the wires. It all original. I have used this to pull my old boat with a flat 4 connectors for 25 years. Never an issue. I am going to check the back of the new trailer pin receptacle to see if there is power there and then follow the wires up to the main junction box on the frame. I have already pulled each of these wire bundles and checked for bad pins etc and they are all appear perfect. I have seen some pictures on line of this junction area being badly corroded etc. Mine is near mint. Not sure where to go from there. Any advice? I’ve scoured the webs looking for ideas. Thanks
Mike S.
9/22/2024
Jameson C.
9/23/2024
Jimmy L.
8/27/2024
My inverter is shorting out. A spark comes from inside the box from a reostat the size of a D battery. It's wet to the touch. But I don't think it is water. I have checked short ground on every plug and wire coming in to the breakers. I'm stumped! Thanks
Jameson C.
8/27/2024
Phil M.
8/25/2024
I tow an RV Trailer with my Subaru Ascent using a Subaru-installed 7-pin connector. I also use a brake controller connected to the wiring harness that accesses the 7-pin. After some challenges, our Subaru dealer repaired the 7-pin connection. My RV trailer lacks reverse lights. At this time, turn signals, brake lights and brake controller work great, but there's a lack of running lights. Would that indicate the #3 pin is not wired correctly or would it indicate a grounding problem. Trying to get back on the road for some fall camping!
Kyle S.
8/26/2024
Philm
8/26/2024
Kyle S.
8/26/2024
Hil M.
8/20/2024
On 7-pin 2020 Orangeline utility trailer, lights won't work (except the license plate lights) when truck (aftermarket 7-pin) has headlights or running lights turned on. NO headlights, all turn signals and brake lights are fine. Horse trailer that truck pulls is fine. This just a brown pin connection thing? How to test there's even power getting to that running light pin on trailer? Thanks.
Bryce D.
8/20/2024
Dennis D.
8/12/2024
On my 2012 three horse slant trailer, a mouse chewed the white and black wires that connect to my interior lights. How do I reconnect them so I can get them working again?
Bryce D.
8/13/2024
Dennis D.
8/13/2024
Bryce D.
8/14/2024
John B.
11/25/2024
Bryce D.
11/25/2024
Gordong
8/3/2024
Good article however there is no coverage of how to wire in a trailer brake breakaway switch.
Jaysonb
7/28/2024
Great resource, thank you! Just curious though - I have a 2022 Toyota Tacoma Limited with the factory installed towing package. I just installed a Redarc brake controller following your eTrailer's recommendation and the install video was very helpful. My question is: Is there anything different about Toyota's 7-pin? I just rewired my equipment trailer and want to make sure I'm not missing anything. At first glance the pin-out from the factory receptacle on the truck doesn't look the same as what everyone says is standard, but maybe that's just my tired eyes. Thank you.
Jon G.
7/29/2024
Jaysonb
7/29/2024
Jon G.
7/29/2024
Matthew
7/22/2024
i have a 5 pin connector for a rv and the blue wire i was told is back up. Ive run that wire to the reverse lights on my rv and when i put it in reverse I get nothing. The reverse light has a red wire and a ground. the other lights have the typical signal brake and marker lights. how do i get the reverse lights to work?
Bryce D.
7/22/2024
Bryce D.
7/22/2024
John B.
11/25/2024
Bryce D.
11/25/2024
Terry
7/1/2024
My rv lifepo4 (14.6v) batteries are back feeding to my truck and causing the trailer brake to error and not work; can't I just remove the positive connection in the system? isn't the 12V on the 7 pin just AUX and not used other than to power the breakaway box; can I / how can I remove the 12v connection that is backfeeding to the truck, I don't need that right?
Paul
7/13/2024
Martin
6/21/2024
I would like to say this is the most complete source of info I have ever seen Thanks
Kenneth
5/14/2024
The "E-Trailer" branded graphic called "7 Way RV Plug Wiring" is at odds with everything else on this page, and seemingly with other sources. I'm just looking to begin diagnosing a brake problem on my own trailer...
Moe
5/14/2024
My signal works good left side try right side all lights blinking even clearance lights
Joseph
4/21/2024
I have a 2001 GMC Sierra 3500HD with no factory installed trailer connection. How do I connect the red controller wire to the brake switch or other brake light cold wire? Thanks,
Jon G.
5/15/2024
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Jan M.
1/9/2024
I rewired my boat trailer per instructions, but no lights. Troubleshooting included rechecked ground (white) wire, used a volt meter to check the car 4-way connector, each light wire and even the bulb socket. All had power. Still no lights when I put the bulb in the socket. Any ideas? Thanks
Mike L.
1/9/2024
Jan M.
1/9/2024
Mike L.
1/10/2024
Phloridaphil
1/24/2024
Mike L.
1/24/2024
Jan
1/24/2024
Mike L.
1/24/2024
Chad
12/9/2023
Hello, I have a 1999 GMC digger Derrick utility truck and it has a round 6 pin plug on the truck side. The trailer I'm going to pull is a large 37' pole trailer and the trailer has a 7 pin round plug. I can't find an adapter anywhere and I think I have to build my own, need some help!
Chad
12/11/2023
John B.
11/25/2024
Neil W.
11/12/2023
Awesome page. I’m trying to replace my 6-pin plug with a 7-pin on my gooseneck trailer. Brakes have worked great with an adapter in the past. When I look at the wiring in the 6-pin, the brake pin is not connected and there isn’t a blue wire. Just a black wire on the 12V center pin. I noticed the page said “Note: In some applications, the black battery power connection and the blue brake controller output connection are reversed.” I’m totally confused how the brakes have been working with the factory brake controller without the brake pin being used. Any help would be appreciated.
Jenny N.
11/17/2023
Neil W.
11/17/2023
Daulton R.
11/8/2023
Thank you for providing the guidance and instruction that you do. It is extremely helpful for a lot of people. The more I visit your site the more I want to come back for help, and purchase from you.
Jenny N.
11/16/2023
Daulton
11/17/2023
Jenny N.
11/17/2023
Daulton
11/18/2023
Ian
4/25/2024
Pj
10/26/2023
We bought a brand new 2023 dump trailer at auction. It was made in Mexico and does not have standard color-coded wiring. We have all lights and brakes, but when we turn on the headlights of the tow vehicle, the brakes on the trailer come on and stay on.
Mike L.
11/12/2023
Helpful Links
Char
10/21/2023
I have a 2008 Dodge Ram 1500, with an unplugged blue plug labelled "Electric Brake" under the dash, but only a 4-flat connector at the rear. What do I need in order to utilize the electric brakes on my trailer?
Nik C.
10/24/2023
Mike L.
11/9/2023
Char
5/8/2024
Mike L.
5/15/2024
Mike L.
11/9/2023
John M.
10/17/2023
I have purchased a used 1992 Bigfoot 17 travel trailer. When connected to my 2009 Dodge Nitro I get RT and LT lights working properly, as are the brake lights and flashing lights.. I do not get running lights working. My buddy connected with his 2015 Cherokee and we got the same result. I have replaced the 7 pin connector - thinking it was faulty - but the same situation exists. My buddy's Cherokee has factory installed trailer brake and when he pulled the trailer the brakes seemed to be working ok. The 12V trailer battery has not been connected through all of this testing. Your thoughts please. Thanks.....john
Mike L.
10/17/2023
Charles
10/10/2023
Hello, I just got a vintage 1988 mallard 28rks 5th wheel. When I got it all d.c. and 12 volt items worked. May have been on shore power I'm not sure. Anyway after trying to hook up the battery nothing worked not even a light. Checked converter all connections look correct. Followed out. Negative is a copper wire coming of Negative of panel going to bus then down into floor to frame. Positive I followed to crossover where it goes into the wall. Another black wire comes out of the wall and goes toward battery. From what I can tell, black Positive wire goes to 6 pin connector which goes to a box with 3 wires all black not hooked up and the ground wire on the connector is not attached at the screw. 1, is this the issue? 2. Can I connect all 3 wires with no issue. 3. Technically can't I hook all to positive as long as my negative goes to frame as needed. Thanks
Mike L.
10/11/2023
Beth
9/18/2023
I want to put a wireless backup camera on my travel trailer, wired into a rear marker light. However, I'm told this camera won't work if I'm pulling the trailer with my 2021 GMC Sierra, because of something called "Pulse wave modulation" causing the camera to not get enough voltage to work? Is there a solution or work-around for this issue?
Beth
9/19/2023
Mike L.
9/19/2023
Beth
9/20/2023
Murat
9/10/2023
Hello All. I need help with loosing power on my Prolite Plus S. After 3 months we went to a short trip and on our stop suddenly light went off inside the camper. It was connected to my Model 3 through Curtis bluetooth controller. When I check the car side power with a multimeter there was no power coming to 7pin connector( I learned that model 3 have electronic breakers it reset it self after sometime). Wait for 24 hours and connected the controller back to car and started to work. Then I connected to camper and loose the power again. I think there is short in the camper but I checked the all fuses and breakers they were all good. Please any idea helps…
Mike L.
9/14/2023
Kennys
8/21/2023
Can anybody tell me if the batt wire lead on a 7-pin can be used to keep a 12v Batt charged that is used to run aerators on my fish hauling trailer? Is there any amp output info available?
Mike L.
8/22/2023
Phil L.
8/9/2023
Where can I find yellow & brown & green & brown trailer wires together to rewire my utility trailer
Mike L.
8/10/2023
Craig V.
7/19/2023
Have a 2018 camper which is almost brand new used very little keeps blowing left turn signal fuse. Also have 2001 Hallmark trailer that blows the same fuse hard to believe 2 trailers have shorts on same circuit. Think it could be on the truck side?
Mike L.
8/2/2023
Russ
7/17/2023
OK so just bought an older RV and it has a 4 Pole round socket at the hitch, I have use of a small trailer with a 7 blade round plug. Question is is there an adapter available to plug the 7 into the 4 on the RV? The 7 blade was used on trailer to plug into a truck with an existing 7 blade at the hitch but trailer has no brake, back up light or 12v supply.
Russ
8/2/2023
Russell
6/29/2023
I have a 7 & a 4 pin connector on my 2020 rv my question is I have a hitch mounted storage box that needs lights and a reverse light I was thinking of using the 7 pin for storage box and 4 pin for boat lights, would there be a problem with that? Also what wire on the 7 pin is reverse light? Thanks
Heather A.
7/17/2023
Jose A.
6/25/2023
I have a 7 pin connector but the wires that were ran do not have a blue wire. Just green black brown yellow red. I hooked wires up with out the blue and the back tire on my trailer locks up?
Mike L.
7/15/2023
Marc
6/5/2023
Hello I have a 2012 Jayco X23b. I am having a problem with the right rear light assembly. Under normal conditions, the brake light and turn signal on the right side work as they should but when you turn on your marker lights for the entire trailer, the right rear light becomes extremely bright, will not show the brake light working or the turn signal. Just stay is extremely bright. Now if you turn the power off to the marker lights, it works like it should turn signal and brake light work together. it is not on the vehicle side I pull a boat trailer and a flatbed trailer as well and do not have that issue with either one of them. Any ideas.???
Mike L.
6/6/2023
Cory
1/13/2024
Marc
1/14/2024
Hi S.
6/3/2023
I'm towing a small 8 trailer with my 2019 1500 silverado and when the truck is off and trailer is still hooked up to my 4 pin flat connector the lights on the trailer will dimly flash occasionally? What can I do to fix this issue?
Michael
4/27/2023
I purchased a Tekonsha T-one Wiring Harness With 4-pole Flat Trailer Connector for my 2017 Range Rover Sport, I tested it and it doesn't seem to receive any electricity. The fuse is ok. I hope someone can give me some advice.
Mike L.
4/27/2023
Helpful Links
Michael
4/27/2023
Michael
4/27/2023
Mike L.
4/27/2023
Derek
4/17/2023
Brakes not working on 5th wheel, 2012 Montana 3400rl brakes not working, use a 2013 chevy 2500hd truck. I hook up camper cable to truck all the lights work but while doing a brake test nothing no trailer brakes even slideing brake controler form low to highest nothing no change. truck does not even acknowledge trailer brake hookup. I changed truck plug first easy enough no change, could not find any bad wires under camper from brakes, check ground wires nothing I did just get new tires put on not sure if that could have done it, before I start spending more money for no change, I could use some advise on this problem..please.
Marcus
2/12/2023
I have a Tekonsha Primus IQ and the wires in my 2022 Tahoe are run but not in a connector. There is a wire labeled “to trailer” does this go to the input or output of the wiring harness?
Mike L.
2/15/2023
Phil
2/6/2023
Installing 4 wireless security cameras, 3 inside 1 outside on horse trailer. Should I tap into running lights for power or is there a better way to approach this?
Mike L.
2/8/2023
Mike L.
3/27/2023
Skyler R.
12/5/2022
I'm having trouble wiring in a new 7 pin plug on my pressure washer trailer. I only have 6 wires: Red White Black Yellow Green and Brown. When I hook the connector to my truck, one tail light comes on, no brake lights and turn blinkers on they all blink. Guess I need to know what the color codes are and if it could be a ground somewhere else. Thanks
Mike L.
12/5/2022
Helpful Links
Skyler R.
12/5/2022
Joe H.
12/4/2022
I have a 6x12 enclosed trailer that all the lights and signals work the way they should. When it's plugged into my 2018 f150 and press the brakes I get the trailer disconnected message. When I let off the brakes I get the trailer connected message. I have found that I have a ground on the brown lead of the wiring harness. I have traced the wiring throughout the trailer but can't seem to find any issues. Any ideas? Thanks
Mike L.
12/5/2022
Justin
1/26/2023
Mike L.
1/26/2023
Helpful Links
Andrew H.
8/2/2022
Hi I have a f150 2018, every time I pull my travel trailer my drunk battery dies. Just finished a long trip during which I had my alternator changed but still ended up with the same problem. Any ideas what could be the problem?
David B.
8/3/2022
Cory E.
7/1/2022
I got a 1973 camper and the trailer plug is gone. Can't figure out the wiring for a new one. It has red green white black wires.
David B.
7/1/2022
Koreyk
10/23/2022
Dennis P.
6/30/2022
I work for a paving and excavating company, we have a 32’, dual axel, dovetail trailer w/ 8’ hydraulic lift ramps…the trailer gets pulled by a 2022 peterbilt 567 tri axel dump truck 7 pin connector…I would like to know the best way to set up so when the trailer is being towed it will charge, or at least maintain, the trailer battery for the ramps?? Thanks in advance!
David B.
7/1/2022
Helpful Links
Joey F.
5/3/2022
Helping my neighbor out. When he connects his trailers flat wire harness to his truck during the day everything works perfectly but come night time when his vehicle sensor comes on to turn on the headlights automatically his trailer lights goes out and stops working.
David B.
5/3/2022
Jason
11/27/2022
Mike L.
12/1/2022
Mike L.
12/1/2022
John M.
4/19/2022
I just purchased a 2004 shadow master 6x12 enclosed single axle trailer. I have power at my connection on my truck but I get nothing lighting up on the trailer at all. the harness for the trailer ends up going inside the frame near the tounge. How to I figure out what's going on?
David B.
4/19/2022
Ben M.
4/10/2022
I installed self-adjusting brakes and when the tow vehicles brakes are activated I can hear a hum from the assembly (which I'm assuming is the magnet activating) but the brakes don't do anything. From an adjustment standpoint the brakes are making contact with the hub when not activated so I think their baseline adjustment is ok. Any thoughts on what I'm overlooking?
David B.
4/13/2022
Helpful Links
Gary
10/5/2022
David B.
10/6/2022
Helpful Links
David B.
4/7/2022
2 trailers;both are wired w/4wire conn. I want to add 2" recv.on larger one and tow the 2nd. I need to run 4wire conn. from Ist to 2nd, How and what do I need to accomplish this? Thank you for your time and advice.
David B.
4/13/2022
Mike R.
3/27/2022
I want to wire my trailer for tail, brake lights with left and right turn signals. The tail lights only have 2 wires and the wire I bought has 4 wires with flat plug in to truck. With only 2 wires on the tail light, what wires do I use of the 4 coming from the truck
Les D.
3/28/2022
Helpful Links
Mark B.
3/14/2022
We have a 7 pin harness on trailer. Most lights work ok but the left blinker only works when the right blinker is activated. Right doesn’t activate with left. Brake light is also inconsistent in working. Thoughts on where to start looking. This site and article is super helpful
Les D.
3/15/2022
Helpful Links
Brent G.
2/21/2022
I have a new Charmac cargo trailer that all exterior lights work properly, but the interior lights will only work if the truck is running??? I want them to be operable with the truck off and keys out out the ignition
Les D.
2/21/2022
Joe W.
12/29/2021
I have a 2017 Ford T150 van with 4/7 connector. When I have any trailer attached, the right turn signals flash really fast on the van, but the signals on the trailer don't work. Running lights, left turns, brakes, all work normal. Is this a ground? fuse? flasher plug? Everything works normal with no trailer attached.
Les D.
12/29/2021
Louis H.
12/14/2021
I have a 2011 toyota tacoma with a new T-one harness installed. I have a new 4 pin trailer harness with led lights installed on a 5x8 tilt trailer. Problem is everything works properly with my lights turned off on the truck but with them turned on: seems like the trailer brake lights are on constantly, no turn signals or variance when the brake is applied.
Les D.
12/15/2021
Helpful Links
Benjamin
10/24/2024
Super quick here. On my new trailer all new lights my truck has a 5 plug well it’s a 7 but only 4 tabs and the center for backups. Without cutting a bunch of new wires, I have a 5 flat to a round 7 adapter to my truck. The 5 flat has the extra mine is blue wire. The new lights ,(pods) for my backups have just the red and black. I know that the blue wire has to hook to them in what way ? Do I run the red and black wires to the white and brown where does this blue hook? I have lost my self in this and normally I can fix anything, ( Country style ) !!