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Roadmaster Universal Hy-Power Diode Wiring Kit

Roadmaster Universal Hy-Power Diode Wiring Kit

Item # RM-154
Our Price: $84.94
Tow Bar Wiring

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Roadmaster Tail Light Mount Tow Bar Wiring - RM-154
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Diode Kit allows you to use your vehicle's tail lights and wiring system while preventing feedback from your RV. 4-Pole flat loop included to connect RV to towed car. Great Prices for the best tow bar wiring from Roadmaster. Roadmaster Universal Hy-Power Diode Wiring Kit part number RM-154 can be ordered online at or call 1-800-496-5010 for expert service.
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Roadmaster Tow Bar Wiring - RM-154

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

Diode Kit allows you to use your vehicle's tail lights and wiring system while preventing feedback from your RV. 4-Pole flat loop included to connect RV to towed car.


  • Connects your RV's tail, brake and turn signal lights to your towed car's lighting system
  • Works with 2-wire and 3-wire lighting systems
    • 2-Wire systems (aka combined) have the stop and turn signal sent along the same wire
    • 3-Wire systems (aka separated) have the stop and turn signals sent along different wires (typically indicated by amber turn signals)
  • Prevents electrical feedback and the damage it can cause to your vehicle's electrical components
  • Kit includes:
    • (4) Hy-Power diodes
    • Molded 4-wire electrical cords - 30' long
    • Power cord - 6' long
    • 4-Way flat wire connectors for both the vehicle and RV
      • If RV has a 3-wire system (and is not already wired for a trailer connector) a converter is required (RM-732 - sold separately)
    • Ring terminal
    • Plastic loom - 3' long


  • 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 lights. Wiring converter kit (154-792-118158) can be purchased instead if you want to retain separate turn and brake signals.

Diode Wiring Diagram

Diode Wiring Diagram

Diode Wiring Diagram

Diode Wiring Diagram

154 Roadmaster Universal Wiring Kit with 4 Hy-Power Diodes

This Product Fits The Following Vehicles

Customer Satisfaction Score:

Customer Reviews

Roadmaster Universal Hy-Power Diode Wiring Kit - RM-154

Average Customer Rating:  4.7 out of 5 stars   (601 Customer Reviews)

Diode Kit allows you to use your vehicle's tail lights and wiring system while preventing feedback from your RV. 4-Pole flat loop included to connect RV to towed car.

2001 Jeep Cherokee

This is the third time I have order base plates and electrical hook ups from etrailer and love this company. We have a 1979 MCI Bus conversion and it is difficult at time finding things for towing etc for it because of age. Not with etrailer, they have it all. We have towed a 96 S-19 chevy, a 98 Jeep was next and this year we got a 2001 Jeep Cherokee which we got the electrical kit for from and the base plates are still on the way. Everything fits nicely and if you are unsure of how it all goes together just watch their video''s on the etrailer website which are very informational.
Thank You for being there when we need you. See you all down the road....

Still working very well and didnt even have to pull the bumper off to install it. very strong units. the electrical hookups worked well also and easy to hookup as well. Lights all work well. The brake cable system I had on my previous Jeep I mover to the cherokee but was a real pain to find a good pass through because of all the mechanicals in the Jeep cherokee but good it through finally.
David - 10/28/2022

2019 Chevrolet Blazer

Product is very well built and is hidden within the bumper/grille. Installation wasn't too difficult, reinstallation of front bumper requires 2 people.
Pleased with end results.


Installation instructions were great, no issues or questions. I ran the wire thru the frame, and used split wire loom and tape to protect wiring when outside the tube frame.


I have rigged several cars for towing, and Roadmaster has a good wide range of products that allow me to get exactly what I need. And they always work as you expect. I have always gotten them via etrailer because they stock them and make sure they work as specified.


The directions and the diodes make this work. The pieces could likely be purchased for a lower price somewhere else but having all together is very worth the kit price. Running the wires through the firewall and to the back of the vehicles is the biggest part of the work but I got it done. Love that feeling of accomplishment.


Good system, worked fine but you have to be ok at wiring and understand the process. I found another wiring kit (on Etrailer) that is all pre-wired with a wire harness with connectors. Plug and play. No cutting or wiring connectors. Overall this kit works well!

2021 Ford Ranger

Very professionally expedited and the installation over the website are priceless. EVERYONE THERE continues to shine.

I made sure that the installation went as smoothly as possible based on my knowledge of electricity electronics. No thing has changed so far. Dependable based on conditions down here with the heat.
Raul - 10/05/2022

2015 Jeep Wrangler

The order was exactly what I needed for my 2015 Jeep. It was easy to install and took may be a couple of hours from start to finish. The instructional video was spot on!
Again etrailer provided excellent service. A great company.


Instructions and pictures are excellent. Easy to install and works as expected.

All good.
Cecil - 09/30/2022


I used the waiting kit on a 2018 Chevy Silverado; my truck has two tail lights and therefore needed an extra set of diodes which were not included with the initial wiring kit. Therefore I has to order an extra diode in order for my turn and brake lights to work properly.

This kit will work if your vehicle has combined lights - which means the turn and tail lights use the same bulb - or on separate light systems - where the turn and tail lights use separate bulbs. If used on a separate light system and 4 diodes are used then the stop light will work as both the stope and turn signal. Adding two diodes part # RM-792
Roadmaster Hy-Power Diodes (Qty 2)
will allow you to use the turn signals on separate light systems.
-- Etrailer Expert Jenny N - 02/15/2022


E Trailer did a great job installing the wiring kit. I can't see where they did anything inside the car and the lights work perfectly.


Worked well. ETrailer’s instructional videos were invaluable. Especially finding space behind the tail light assemblies for diodes!

Jeep Wrangler

I have purchased many items from etrailer and have never been disappointed, with the products being top shelf, delivered on time, and the customer service is top shelf as well. After I get it installed I will send some pictures, to show the quality of the Product . Blue OX backing plate for a Jeep Wrangler. Thanks etrailer for your fast service and free shipping!


Well I was really happy that their sales technician Sherry S. Help package all the required other parts to complete the 4 x4 flat tow job.


It works great. I use my CRV to be my tow vehicle for my RV and use it to tow my kayak trailer. This kit made the wiring job easy for both and after 1 year it’s been perfect

Perfect, always works when I need it which is often
Merlin - 02/06/2022

2014 Jeep Cherokee

I bought all of my products for flat towing my 2014 Jeep Cherokee for etrailer and I couldn’t be happier. The service was exceptional, the pricing was right, and when I did have a problem, they were right there to take care of it. When I need more goodies for the RV, I will be back!!!!


Only towed 2000 miles so far, then rear ended and pushed into front vehicle. Hope body shop left brackets in place!!!

Install was easy. thank you


Worked great. Not hard to install. Wish the kit came with a fuse disconnect switch.

After a year I would purchase again. Works as stated, and have had no problems.
Leonard - 03/30/2022

2019 Jeep Wrangler

Great product and thanks to for the excellent videos detailing how to install the Demco Stay-In-Play Duo braking system. As a result of watching all of the available videos, I learned that there where a couple of different ways to install the system in our Jeep Wranglers. The first installation I did was in our 2019 Wrangler and that was super easy following the one video on your website. The second installation of the system was not as easy because our 2021 Wrangler has a manual transmission and required having to drill a hole in the firewall/floor board to run the wiring and vacuum tube from the passenger compartment to the engine area. If ever has an installation on a Jeep Wrangler with a manual transmission to perform, hopefully they will video tape that installation to guide customers with Jeeps with manual transmissions. I think's idea of mounting the control box on the fuse box is by far the cleanest and easiest way to install the Demco braking system.
I also followed's videos for installing the brake light system and the base plate on both our Wranglers and could not be happier with them. Thanks etrailer for all you offer.


I have ordered from etrailer for years and why I come back is I know from experience the type of service they provide!

Carlos - 03/20/2022


Just what we needed to have lights on our RV's tow vehicle. Easy to follow instructions and simple to install. Affordable option.


I'm not happy cause it isn't plug n play as I was told. I have not put it on yet. I'm afraid if I cut wires it will ruin my warranty.


Easy to install. Videos are great

Chevrolet Equinox

For the installation the instructions were good, but watching some videos made it much easier to take apart a brand new car. All went well. Installed on a 2020 Chevy Equinox 2.0


Worked as intended on our 2021 Ford Esc ape

Show More Reviews

See what our Experts say about this Roadmaster Tow Bar Wiring

  • Wiring a 1994 Toyota Pickup to Tow Behind a Motorhome
    We carry wiring kits for towing vehicles behind motorhomes. I would recommend RoadMaster part # RM-154. It is a complete kit that will let you wire your 1994 Toyota Pickup to be towed behind your motorhome without using the magnetic tow lights. Since your Toyota should have separate brake and turn signals, you will need one of two wiring diagrams based on whether or not your motorhome has seperate turn signals. Thumbnails of these diagrams can be seen towards the bottom of the product page...
    view full answer...
  • Wiring a 1994 Jeep YJ for Towing Behind a Motorhome
    The T-One harness you were looking at is to tow a trailer behind the Jeep. It will not work in reverse to tow the Jeep behind a motorhome. You will need RoadMaster part # RM-154. There are wiring diagrams on the page to show you how to wire it depending on the taillight configuration of your motorhome.
    view full answer...
  • Does License Plate of Tow Vehicle Need Lit Up When Flat Towing
    It is true that the tow bar lighting kits like the part # RM-154 do not illuminate the license plate of the tow vehicle and it's not really an issue. Reason being is that the plate of the vehicle that's actually driving would still be illuminated (the tow vehicle). The reason you don't need to have the towed vehicle plate illuminated as it's not a vehicle that's doing the driving so being able to identify that vehicle is not relevant since it's not making choices on the highway like the...
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  • Troubleshooting Lighting Issues After Installing The Roadmaster Diode Kit On A 2008 Jeep Wrangler
    If the left light on your 2008 Jeep Wrangler Unlimited is dull after installing the Roadmaster Universal Hy-Power Diode Wiring Kit Item # RM-154 then you have a connection issue. I recommend checking the wiring and making sure there is no loose or damaged wiring. If you're having issues when hooked up to the motorhome then first you want to make sure it's wired correctly. The lighting on your 2008 Jeep Wrangler Unlimited is combined. I've attached the wiring diagrams for a combined wiring...
    view full answer...
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  • How to Determine If My RV Has Separate or Combined Lighting for Installation of Roadmaster Diodes
    I do believe you're asking how to determine whether or not your RV has a combined or separate lighting system. If the motorhome’s trailer plug energizes the same pins on the 4 way connector for both brake lights and turn signals, then a 3-to-2 converter is already installed and the motorhome should be treated as combined lighting when installing the Roadmaster # RM-154.
    view full answer...
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  • Does Roadmaster Universal Diode Wiring Kit RM-154 Fit 2022 Jeep Wrangler Unlimited with LED Tailligh
    The install of the Roadmaster diode kit part # RM-154 is perfectly compatible with your 2022 Jeep Wrangler Unlimited that has LED taillights and does not require any additional steps.
    view full answer...
  • Diode Wiring Kit for Flat Towing 2016 Nissan Rogue
    The diode wiring kits for flat towing vehicles can install basically on any vehicle so you could use the part # RM-154 and be set.
    view full answer...
  • Procedure for Flat Towing 2015 Ford Edge
    According to what I've read in the owner's manual, your Edge can indeed be flat towed if the specific procedures listed in the owner's manual are followed precisely. To flat tow your Edge, hook up to the motorhome then press and hold the brake to the floor. Start the vehicle and shift into Neutral with the brake pedal still pressed then turn off the vehicle. On a keyless start equipped vehicle, push the keyless start button one to shut off. If the vehicle has an ignition key, turn the vehicle...
    view full answer...
  • Which Taillight Bulbs Does RM-154 Flat Towing Diode Wiring Kit Tap Into on 20020 Chevy Colorado
    When we installed the # RM-154 diode kit on a 2019 Chevy Colorado, we tied the diodes into the top bulb which provides the taillamp, turn signal and brake lamp function. For greater visibility, you could run a jumper to the lower bulb if you wish, but it isn't necessary. I've linked a to an installation video for a different kit, but the diodes install in the same manner. This video shows the wiring connections in greater detail.
    view full answer...
  • Installing The Roadmaster Universal Hy-Power Diode Wiring Kit # RM-154 In A 2012 Fiat 500
    To determine the wiring for your 2016 Winnebago View you can look at how the tail lights function. If the brake light also functions as your turn signal then you have combined lighting. The lighting for your 2012 Fiat 500 is wired separately so once you know what the wiring for your motorhome is you can use the corresponding wiring guide I've attached for the Roadmaster Universal Hy-Power Diode Wiring Kit # RM-154.
    view full answer...
    Image 1 for Image 2 for Image 3 for
  • Can Roadmaster Tow Bar Diode Wiring Kit # RM-154 Install on 2021 Chevy Colorado
    Yes you can use the Roadmaster Tow Bar Wiring kit part # RM-154 on your 2021 Chevy Colorado. I attached an install video for this on a similar 2020 Chevy Colorado for you to check out as well. This kit does not require the vehicle battery to be disconnected so it would not interfere with that in any way.
    view full answer...
  • 2021 Jeep Gladiator Flat Tow Wire Harness
    For tow bar wiring I suggest the Roadmaster Universal Hy-Power Diode Wiring Kit # RM-154. It works with combined or separate wire systems, prevents electrical feed back and keeps your vehicles safe from each other.
    view full answer...
  • Which Wires Are the Diodes Installed on for the Tail Lights on a 2018 Jeep Wrangler JL
    I can confirm when installing the Roadmaster Universal Hy-Power Diode Kit # RM-154 on a 2018 Jeep Wrangler JL that the tail light wire on the driver's side is white and grey, and the tail light wire on the passenger side is white and orange. These will be the wires you'll use to connect the diodes on the kit to. I've also linked an installation video of this wiring kit on a similar Wrangler JL for you to use as a reference.
    view full answer...
  • Flat Tow Wiring Harness for 2019 Ford F-350 Super Duty
    There is a flat towing wiring harness for your 2019 Ford F-350 Super Duty, but the Hopkins one you mentioned is not a fit; it is only a fit for certain model year F-150's. There are no plug-in harnesses for your F-350 so I recommend a simple splice-in harness instead, the Roadmaster Universal Hy-Power Diode Wiring Kit # RM-154.
    view full answer...
  • Can 4 Pole On The Back 1994 Jeep Wrangler Be Used To Proved Taillight Functions When Flat Towing
    The 4 pole plug on the back of your 1994 Jeep Wrangler is intended for lights on a trailer. If you are wanting to provide lighting to your Jeep while it is being towed I recommend Roadmaster Universal Hy-Power Diode Wiring Kit Item # RM-154. This kit provides the diodes for the taillights on the Jeep, wiring from the diodes to the front of the Jeep with the 4 pole end, the 4 pole umbilical and the 4 pole end to be wired into the motor home. I have provided a link to a video to help walk...
    view full answer...
  • Recommended Flat Tow Wiring For 2005 Scion XB
    It sounds like you're actually looking for the Roadmaster Hy-Power Diode Kit # RM-154, which will connect your RVs tail light signals to your tow vehicle. This diode kit helps protect the vehicle from electrical feedback that could cause damage and works with both combined and separate lighting systems. I've linked a short review video of this kit for you to check out. If you need any other flat towing parts, just let me know and I can help you locate them.
    view full answer...
  • Does Roadmaster Universal Hy-Power Diode Wiring Kit Work With LED Lights
    Yes, the LED lights on your truck will not affect the Roadmaster Universal Hy-Power Diode Wiring Kit # RM-154. You will be able to use this kit with those lights and it will work well. I have added a link to a video review below for you to take a look at also.
    view full answer...
  • Recommended Plug-In Flat-Tow Wiring Harness for a 2001 Jeep Grand Cherokee
    I have some great flat-tow wiring harness options for a 2001 Jeep Grand Cherokee. That said, the trailer wiring harnesses which is what you were looking at are different than the flat-tow wiring harness options which is what you need. If you want the signals sent through the taillight then I recommend using the Roadmaster Universal Hy-Power Diode Wiring Kit part # RM-154. There won't be any plug-in-play options though.
    view full answer...
  • Are Resistors Needed to Install Roadmaster Hy-Power Diode Kit on 2019 Chevy Equinox Premier
    I checked with Roadmaster and for the Premier model of your 2019 Chevy Equinox the Roadmaster Universal Hy-Power Diode Wiring Kit # RM-154 will work perfectly without additional components like a resistor. The Premier option features LEDs inside the taillight housings that are directly compatible with the Diode Kit.
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  • Recommended Tow-Bar Wiring Kit For 1997 Jeep Wrangler
    the 4-way on the rear of your Jeep is used for output and cannot be connected to the motorhome to provide the lighting when towing your Wrangler. The tow-bar wiring kit I recommend for your 1997 Jeep is part # RM-154. I have attached a drawing that shows how the wiring needs to be installed. The # RM-154 kit comes with a 4-way connector that will plug into your motorhome 4-way connector. I have also attached a link to a helpful article that explains what is needed to flat-tow a vehicle....
    view full answer...
    Image 1 for
  • Can Tow Bar Wiring For 2013 Jeep Wrangler Be Used On 2015 Jeep Cherokee Trailhawk
    If you are planning on flat-towing, both the 2015 Jeep Cherokee Trailhawk and the 2013 Jeep Wrangler can use the same tow bar wiring harness, part # RM-154. This harness will work with 2-wire and 3-wire lighting systems. All of the needed equipment is included with this kit. This will plug directly into the 4-way connector on your camper. I have attached a link to an installation of this kit on a 2014 Cherokee, which should be very similar. I have also attached some helpful articles...
    view full answer...
  • What Parts are Needed to Flat Tow a Vehicle Behind a 2013 Fleetwood Bounder Class A Motor Home
    There are 5 items you will need to flat tow a vehicle: base plates for the vehicle, a tow bar that is compatible with the base plates, safety cables, lighting, and supplemental braking. But first, consult the owners manual of the vehicle you want to tow to determine if it can be flat towed and for any other specific information regarding recreational towing. The base plates are vehicle specific so I would need to know the year, make, and model to recommend the proper base plates. I have...
    view full answer...
  • Tow Bar Lighting Recommendation for 2015 Titanium Ford Edge
    I checked with Roadmaster and the diode kit part # RM-154 has been confirmed as a fit for your 2015 Ford Edge without any LED light exclusions so I would recommend it for you. I attached an install video link that shows this light kit being installed in a 2015 Ford Edge just like yours.
    view full answer...
  • Wiring Guide for Roadmaster Universal Hy-Power Diode Wiring Kit # RM-154
    Based on my research both your 2002 Bounder motorhome and your 2000 Dodge Durango have combined brake/turn lights. So in this case you will wire the Roadmaster Universal Hy-Power Diode Wiring Kit # RM-154 as shown in the linked wiring diagram.
    view full answer...
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