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Roadmaster Universal Hy-Power Diode Wiring Kit

Roadmaster Universal Hy-Power Diode Wiring Kit

Item # RM-152
Our Price: $81.68
Tow Bar Wiring

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Shipping Weight: 1.73 lbs
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Roadmaster Splices into Vehicle Wiring - RM-152
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Diode kit allows you to use your vehicle's tail lights and wiring system while preventing feedback from your RV. Wires 2-wire and 3-wire systems to operate as a combined lighting systems. Connectors and Extension loop sold separately. Great Prices for the best tow bar wiring from Roadmaster. Roadmaster Universal Hy-Power Diode Wiring Kit part number RM-152 can be ordered online at or call 1-800-940-8924 for expert service.
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Roadmaster Tow Bar Wiring - RM-152

  • Diode Kit
  • Splices into Vehicle Wiring
  • Tail Light Mount
  • Universal
  • Roadmaster

Diode kit allows you to use your vehicle's tail lights and wiring system while preventing feedback from your RV. Wires 2-wire and 3-wire systems to operate as a combined lighting systems. Connectors and Extension loop sold separately.


  • Lets you wire your vehicle to accept your RV's tail, brake, and turn signal lights for flat towing
  • Wires towed car as combined system so that brake and turn signals travel along same wire
  • Prevents electrical feedback and the damage it can cause to your vehicle's electrical components
  • Aluminum case protects diodes from the elements
    • Powder coated aluminum is corrosion resistant
  • Includes 4 Hy-Power diodes; 30' long, 4-wire harness; wire connectors; cable ties; 1 ring terminal; and 3' long plastic loom
    • Extension loop for connecting towed car to RV is sold separately
    • Brake light relay (RM-88400 - sold separately) may be required if used with supplemental braking system
  • Limited Lifetime Warranty


  • Max amperage: 85 amps
  • Max voltage: 24 volts

Note: For applications that have separate lighting, this kit will cause your brake lights to function as both brake and turn signal lights. A wiring converter (118158 - sold separately) and 2 additional diodes will be needed if you want to retain separate turn and brake signals.

Separate vs. Combined Lighting Systems

Some automobiles operate on a 3-wire system, wherein the brake signal and the turn signals travel along different wires to illuminate different lights. (Typically, these vehicles have amber turn signals.) This is referred to as a "separate lighting system". When you hook up for flat towing using this kit, your towed car's lighting system will operate in a combined fashion regardless of whether it typically has combined or separate lighting. This means that the brake and turn signals sent by your RV to your towed car will be carried on a single wire. As a result, your car's brake lights will do the flashing for the turn signals. Your vehicle will still function as designed when not hooked up to your RV.

Diode Wiring Diagram

Diode Wiring Diagram

Diode Wiring Diagram

Diode Wiring Diagram

Do You Need a Brake Light Relay?

Because this kit wires your vehicle as a combined system, a brake light relay (RM-88400 - sold separately) may be required if you use a supplemental braking system with your towing setup. A supplemental braking system depresses the brake pedal in your towed car every time you apply the brakes in your RV. So, if your towed car's brake lights illuminate when the brake pedal is pressed and the engine is off - as is the case when towing - then you need to install a relay to ensure that the lights on your towed car always act in accordance with the signals sent by your RV via the wiring harness. Without a relay, the brake signal from your towed car will override the turn signal sent by your RV when you slow down to make turns, creating a potential hazard.

152 Road Master Economy Towed Car Wiring Kit with 4 High Power Diodes

Customer Satisfaction Score:

Customer Reviews

Roadmaster Universal Hy-Power Diode Wiring Kit - RM-152

Average Customer Rating:  4.7 out of 5 stars   (211 Customer Reviews)

Diode kit allows you to use your vehicle's tail lights and wiring system while preventing feedback from your RV. Wires 2-wire and 3-wire systems to operate as a combined lighting systems. Connectors and Extension loop sold separately.


have successfully completed the installation of the following items that I purchased from etrailer:

> Nighthawk RM-676 tow bar
> RM-524458-5 base plate
> DEMCO Stay in play DM86VR
> RM-152 diode wiring kit
> RM-156-25 charge wire kit
> RM-88400 brake switch relay kit

I work slow but methodically. I had no issues other than the high degree of difficulty for a 68 y/o man working alone. This project exceeds the abilities of someone NOT mechanically inclined. There is also the need for some specialty tools. I found that feeding the wiring through the dash, firewall, and underbody was more difficult than installing the front baseplate. Overall, I am satisfied with the function of this installation. I am glad I did it myself rather than having it done.

Tow vehicle: 2021 Entegra Emblem 36U
Towed vehicle: 2018 Ford Fusion Platinum Energi



I have no regrets with this purchase. Items preform as advertised with no issues. I am very satisfied with Roadmaster and Demco products.


Negative battery disconnect system started not working after less than a year
Had to go to local Chevy Dealer to have the battery disconnect system disconnected as was causing whole electrical system to shut down at inadvertent times

Etrailer Expert

Jenny N.


The wiring kit does have a limited lifetime warranty and I wanted to ask if you have reached out to Roadmaster?


Everything works for the braking system. Very easy to hookup.


Just finished installing the “kit”, everything went well, the video on the etrailer web site helped but was slightly different than my installation since it was a 2006 model and mine is a 2012.

Should make towing and hooking/unhooking easier and safer than using the magnetic lights.

I’m using the Pollack 6 pin connector with the wiring “kit”.

Steve C.


Works Great, Totally Transparent During Towing or Normal Use


Photos of RM-98700 Installation in 2020 Ford Ranger Lariat.


Product quality was not a issue. However the instructions for hooking car to rv was to place the power cord below the safety cables. This resulted in damage by dragging. Had to purchase a new cord now place it on top of safety cables. NO more issues.


Installed a Blue Ox Base Plate kit on a 2015 Cadillac SRX. The base plate arrived promptly and was well packaged considering its weight. Watched the videos etrailer provides and used them as a step by step video guide. The videos were a big help. Installation is not too difficult if you're mechanically inclined. Had someone help with the installation but one person can perform the installation. I think the base plate is well engineered and everything fit as it should. Love the fact the installation is so well hidden. We have about 400 miles on the installation and have had no issues. Thanks to etrailer for a great price, great service, and great product support.


We just came back from fmca show in Perry ga and I can’t say enough about roadmaster they came by our motorhome and inspect the hitch and oiled and left us a note that it was good shape.

Let me say 1 more thing don’t let camping world install it on your car they did our 1st car and they installed it wrong and never worked right or couldn’t get it unhooked without a hammer and pin


Very easy install


Produce was well described and arrived on time with clear installation instructions.


The kit was fine. We couldn’t use it on our truck.


Upgraded to a new tow vehicle and etrailer had all of the components that I needed. I was working with a short timeframe to get the new vehicle adapted before hitting the road for the summer. All parts were delivered promptly and with no damages or missing parts.


If you want knowledge people who know what they are doing all you have to do is call e-trailer!
This is what I needed as a final step in getting on the road with my truck in tow! I have talked with more than a few parts providers, including Blue Ox, trying to get this project done. None of them came in even a distant second!


The videos were very helpful as it was the first time assembling the tow package. Probably took me about 20 hours in total. The videos sure make it look easy. Drilling the holes into the frame, for the bolts was probably the hardest thing. Make sure you use the permanent lock-tight, they will vibrate loose! Thanks for all the helpful videos. Tow package works great.


We purchased a used motorhome that had the Blue Ox Towing as well as the Patriot Brake system. We needed to order the tow plate for our toad as well as a few other items to get the set up ready. Kim was amazing at helping me get all of the parts needed to get us rolling! etrailer is the BEST!


Great product. Worked perfectly.


The diode kit wiring kit was about 5 feet too short on a 2014 CRV one of the the shorter SUV one could pull. Had to get another trailer wiring kit to chop apart to splice a longer section in. How much would it have cost to add 5 feet of wire? Wasted time and money!


An easy install (if you watch the video), with quality products. Works like a charm!! The price and service was excellent!


No problems. Did exactly what I needed!


Excellent service, knowledgeable and patient. Quick delivery, All excellent!


Hey George, just dropping a short line to let you and etrailer know that I'm definitely satisfied with your products. I'm using both the diode wiring kit and front tow hitch to tow behind the motorhome. Both have worked well over the past year. Your online videos were also a great help in understanding how and why your products work. I look forward to reaching out to etrailer again if/when I need additional upgrades to my Jeep.


It is so easy to work with eTrailer!! A couple of phone calls and all your questions are answered. Their videos are also spot on and helped me tremendously when the place that installed the base plate said that they wouldn't install the BRK2505 brake breakaway kit. A simple view of their video and i was confident I would be able to tackle this portion of the install. thanks eTrailer, GREAT JOB!!


Unit work well on our 2014 Honda CRV, they installed it with out any problem.


Durable and well constructed, you know when it is connected.


This review is for E-Trailer. I ordered a complete dinghy towing set-up for the dinghy as a towbar came with the RV we purchased. I called E-Trailer and spoke with a very knowledgeable young lady and when I told her what I needed in layman’s terms she came up with what I would need to complete the dinghy preparation in order to safely tow it behind our RV. Everything they said it would do went just as the instructions directed. I ordered a Roadmaster Falcon 2 set up for the dinghy and they suggested a Blue Ox self contained braking system for the SUV itself. hey also suggested the complete wiring system and plug for the dinghy. To my amazement after the RV and dinghy were connected that also was as easy as they said it would be. Our first tow with the dinghy was great and the unhooking was also a very easy experience. This company was awesome to work with. Thank you for your knowledge and great products.

Show More Reviews

See what our Experts say about this Roadmaster Tow Bar Wiring

  • Is There An Installation Video of the Roadmaster Bulb and Socket Kit on a 2017 Ford F-350
    At this time we do not currently have a video of the installation process of the Roadmaster # RM-152-LED kit on a 2017 Ford F-350, but as soon as we do get an opportunity to make one we will certainly be looking to take advantage. To install a Roadmaster Bulb kit like the # RM-152-LED you'll need to remove the tail light housing on your vehicle and just choose the best spot for a 1" hole to be drilled without interfering with any of the other lights or wiring components. You could potentially...
    view full answer...
  • What Color Are the LEDs That Come With the Roadmaster Tail Light Wiring Kit for Towed Vehicles
    The Roadmaster Tail Light Wiring Kit for Towed Vehicles part # RM-152-LED comes with red LEDs which are needed because with LEDs you must use a bulb color that matches that of the tail light housing in order to get a true color. The bulb type that is used is indeed an 1157 so there would be different intensities based on if the stop or tail lights were activated. Please note, the Replacement LED Bulbs and Sockets part # RM-152-2 are just the replacement LEDs for the Roadmaster Tail Light...
    view full answer...
  • Replacement Diodes for Roadmaster Diode Kit
    You can replace the diodes from the Roadmaster Hy-Power Diode Kit # RM-152 with the Roadmaster Hy-Power Diodes (Qty 4) # RM-794, which come in a pack of 4.
    view full answer...
  • Troubleshooting Brake Light Failures When Flat Towing A 2019 Buick Envision
    The Roadmaster Even Brake Portable Supplemental Braking System # RM-9400 wouldn't affect your brake lights in that manner. You most likely have a short or loose connection in the tow bar wiring which is causing the turn signal to work but not the brake light. You'll need to check all of the wiring running from the tail lights to the 4 or 6 wire port you have on the front of your 2019 Buick Envision for any shorts, kinks, or brakes in the wires or a complete disconnection of any wires. Your...
    view full answer...
  • Parts Needed for Roadmaster Invisibrake and Tail Light Wiring Kit for a 2016 Chevrolet Sonic
    You need to have a diode kit installed regardless of which braking system you are using, this is what lets you connect your RV's tail, brake, and turn signal lights to your towed car's lighting system so that your brake lights and turn signals illuminate. This is a requirement for flat towing. You can use the Roadmaster Tail Light Wiring Kit for Towed Vehicles # RM-152-LED to accomplish this. You will also want the Roadmaster FuseMaster Fuse Bypass # RM76511 which replaces your Chevrolet...
    view full answer...
  • Roadmaster Bulb And Socket Tail Light Wiring Kit Functionality
    If you're wanting to install a bulb and socket kit like the Roadmaster Tail Light Wiring Kit for Towed Vehicles # RM-152-LED to bypass your vehicle's wiring you could. The bulbs in this kit are designed to be placed in your tail light housing next to your vehicle's bulbs and the wiring run to the 6-wire port at the front of your vehicle to connect to your RV with. If you're meaning that you want to replace the bulbs in your vehicle then no, you would not be able to use the # RM-152-LED...
    view full answer...
  • Will the Roadmaster Tail Light Wiring Kit # RM-152-LED Provide All Lighting Functions
    Yes, the Roadmaster Tail Light Wiring Kit for Towed Vehicles, # RM-152-LED, will operate tail, stop, and turn signals with one LED blub per side of the vehicle.
    view full answer...
  • Tow Bar Lighting Kit Recommendation for 2006 Saturn Vue
    We checked with Roadmaster and the LED bulb and socket kit you like part # RM-152-LED is a confirmed fit and will work great! We actually had the chance to install this kit on a similar 2007 Saturn Vue that I attached an install video that covers.
    view full answer...
  • Will Roadmaster LED Tail Light Bulb and Socket Wiring Kit Work with Incandescent Bulbs on an RV
    Yes, but, your RV likely has a trailer connector on it already and that connector is not tied into the RV tail light wiring so it would not affect Roadmaster Tail Light Wiring Kit for Towed Vehicles - LED Bulb and Socket - Red Item # RM-152-LED. Even if the RV did have a connector that was spliced into the tail light wiring on the RV this kit would still work for you! I have included a link to a video showing an example installation on a 2017 Chevy Spark.
    view full answer...
  • Is There a Specific Location to Install the Wiring Kit # RM-152-LED on a 2017 GMC Sierra 1500
    The 1" hole for the Roadmaster Tail Light Wiring Kit # RM-152-LED isn't actually very specific. Just as long as you have enough room for the LED bulb. I wish I could be a little more specific but we have never installed this kit on a 2017 GMC Sierra 1500 ourselves (as of Sept 2018) so we don't have an exact video to reference and the installation instructions are very generic. I have linked installation videos on a 2016 GMC Terrain and a 2003 Toyota Tacoma so you can get an idea of where...
    view full answer...
  • Diode lighting Kit Needed For Flat Towing A 2020 Jeep Gladiator With LED Lights
    Since you have LED tail lights the Roadmaster 4-Diode Universal Wiring Kit for Towed Vehicles - 7-Wire to 6-Wire Straight Cord Item # RM-152-98146-7 will not work. Instead you'll need the Roadmaster Tail Light Wiring Kit w/ 7-Way to 6-Wire Connector - LED Bulb and Socket - Red Item # RM-152-LED-7.
    view full answer...
  • Difference Between Roadmaster 4-Diode Universal Wiring Kits with Straight and Hybrid Cords
    That's literally the only difference between the two wiring kits. The Roadmaster 4-Diode Universal Wiring Kit # RM-152-98146-7 comes with a straight cord while the Roadmaster 4-Diode Universal Wiring Kit # RM-152-1676-7 comes with a "hybrid" cord that is straight on one end and coiled on the other. I prefer the coiled option as it helps to keep the wiring above the ground easier. The only time a straight cord is better is if the tow bar has channels to route the wiring through. For a...
    view full answer...
  • Bulb and Socket Kit for Flat Towing that Uses LED Bulbs
    There is an LED bulb and socket that you can use for flat towing. It is # RM-152-LED. The LEDs are red which work better than white lights if behind a red lens. I have linked a video showing an example installation for you.
    view full answer...
  • Is There A Diode Kit That Will Also Light The Front Side Marker Lights On A 2011 Jeep Wrangler
    If you're looking for a kit to light the side marker lights while flat towing then no, there is not currently any kits made for this purpose. The only way to get lights up front would be to use a tow bar like the Roadmaster Nighthawk All Terrain, Non-Binding Tow Bar # RM-676, which comes with built in LED lights along the arms to help alert other drivers of your presence on the road. If you're just wanting to replace the side marker lights with something brighter then there are kits available,...
    view full answer...
  • Tow Bar Lighting Recommendation for 2014 Honda CR-V
    For lighting you can use the diode kit, # RM-15267, and not have to worry about cutting into the taillight housing. This will splice into your taillight wiring to allow your tow vehicle to control the taillight assemblies of the towed vehicle. This comes with a round 6-way connector that you will install on the front of your towed vehicle and enough coiled wire to go from there to the RV. I attached an install video for this on a similar 2014 Honda CR-V for you to check out as well.
    view full answer...
  • Bracket For Mounting Roadmaster Diode Kit on 2019 Chevy Colorado
    I have added a photo for you from a linked video showing you the mounting location we used on a 2019 Chevy Colorado for the Mount Bracket, Long # 18136. If you go to about the 1:15 mark of the linked video, it talks about using the mounting bracket on the Colorado when installing the Roadmaster Diode 7-Wire to 6-Wire Flexo-Coil Wiring Kit # RM-15267.
    view full answer...
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  • Is Brake Lite Relay Needed When Installing Bulb and Socket Kit on 2009 Ford Escape Hybrid
    Yes, since your braking system presses the brake pedal of your 2009 Ford Escape and the brake lights come one with the ignition off you need to use a brake lite relay part # RM-88400 so that the LED bulb and socket kit part # RM-152-LED turn signals will still work when the brakes are applied.
    view full answer...
  • Tow Bar Wiring Recommendation for 2016 Ford F-150 with Backup Sensors in Taillights
    You can certainly use diodes, as you referenced, to install towed vehicle wiring on your customer's vehicle. To wire the 2016 Ford F-150 with the back-up sensors in the taillights I recommend using a Roadmaster Diode Kit, like the Roadmaster Diode 7-Wire to 4-Wire Flexo-Coil Wiring Kit # RM-15247. I confirmed with my contact at Roadmaster that the diode kits will not interfere with the sensors in the taillights. This kit includes the 4 diodes needed to wire the taillights for use while...
    view full answer...
  • Adding Tow Bar Wiring to 2018 Toyota Camry Being Towed on a Dolly
    You can add lights to your Camry that is on a tow dolly, but there isn't a conversion kit or anything of the sort. The only thing that you can do is add tow bar wiring such as the Roadmaster Universal Hy-Power Diode Wiring Kit # RM-152, cutting off the 4-way from the tow dolly and connecting all of the wires inside a junction box like # 38656. I have added links below to some video reviews of these parts for you to check out as well if you'd like.
    view full answer...
  • LED Bulb & Socket Tow Bar Wiring Compatibility With 2020 Ram 2500
    When wiring in the Roadmaster Tail Light Wiring Kit w/ 7-Way to 6-Wire Connector - LED Bulb and Socket - Red Item # RM-152-LED-7 you'll want to place the bulbs in the red portion of the tail lights. Without seeing your tail light assembly fully taken apart to know where you'll have enough clearance in the red portion of the lights it's hard to say a specific spot will work. The LED bulb is going to stick into the light assembly 2" so as long as you have that amount of space it should be fine.
    view full answer...
  • 2021 Ford Ranger Separate 4-Way Connector to Bypass OEM on Tailgate Light Bar
    According to my research the stop and turn signals on your 2021 Ford Ranger are on the same circuit so you can use a universal wiring kit like the Tekonsha # 119250KIT. I like this kit because you connect the power directly to the battery on your Ranger so the splices that are make are essentially just triggers and they won't overload the circuits on your truck.
    view full answer...
  • Can Roadmaster 4 Diode Tow Bar Lighting Kit Install on Vehicle with Separate Turn Signals
    The Roadmaster 4-Diode Universal Wiring Kit for Towed Vehicles # RM-152-98146-7 can work on your 1994 Jeep Wrangler that has separate turn signals from stop lights. It will wire to your Wrangler in a way that operates the stoplights just like a vehicle with combined taillights. So now your stop lights have two brightnesses (not really a word), lower illumination for stoplights and brighter for stoplights. With this kit installed it will allow the running lights to be on when the headlights...
    view full answer...
  • Will Standard Tow Bar Diode Kit fit 2021 Jeep Wrangler with Premium LED Lighting Group
    For your 2021 Jeep Wrangler the Roadmaster 4-Diode Universal Wiring Kit for Towed Vehicles, # RM-152-98146-7 is what I suggest. There is nothing different needed for the lighting setup that you have.
    view full answer...
  • Tow Bar Lighting Recommendation for a 2004 Toyota Tacoma
    For lighting for your 2004 Toyota Tacoma you can use the diode kit, # RM-152, and not have to worry about cutting into the taillight housing. You will also want the # BX88206 to connect this lighting solution to your tow vehicle. This comes with a round 6-way connector that you will install on the front of your towed vehicle and enough coiled wire to go from there to the RV. The front turn signals will not be activated when using this setup.
    view full answer...

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