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Roadmaster Universal Hy-Power Diode Wiring Kit

Roadmaster Universal Hy-Power Diode Wiring Kit

Item # RM-154
Our Price: $84.80
You Save: 41%
Tow Bar Wiring

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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 1-800-940-8924 for expert service.
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Roadmaster Tow Bar Wiring - RM-154

  • 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. 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

Compare to Tow Ready TR118821

This Product Fits The Following Vehicles

Customer Satisfaction Score:

Customer Reviews

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

Average Customer Rating:  4.8 out of 5 stars   (737 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.


It does what it says on the tin. Easily lit up my XJ so I could tow it. Only regret is that by making the connections at the rear, you don’t get the front market lights on the toad. I should have connected the running lights diode in the harness under the dash so all the marker lights come on at night.

2015 Subaru Forester

etrailer is a great company for towing products. They have fast delivery and they have nice installation videos. This order I added 2 more diodes to wire my 2015 Subaru Forester to have separate wiring for break, running, and turn signal lights.


Items arrived right on schedule and in good order. I ordered three items in the last few weeks. Their CHAT agents were extremely helpful in answering all my questions about compatibility with my vehicle.



Diodes were not the ones I needed even though the etrailer site said they were. I had to purchase the correct ones from the auto electric shop where I had the wiring done.

Etrailer Expert

Jenny N.


@Kenneth Honestly, I am surprised that the diodes did not work for you. I am curious as to if the installer explained why they would not work for you. What the reason was?


I’m always extremely satisfied with Roadmaster products. I had just bought a new truck and planned on towing it so I needed everything to get it ready to tow. This review also applies to to the other items I purchased.

Toyota Land Cruiser

I used this on a 1988 Toyota Land Cruiser, so I could flat tow it behind an Motorhome. Easy to install!

2015 Jeep Wrangler

Lori was spot on in making sure I got the correct base plate assembly and light package for my 2015 Jeep Wrangler Sport. Deliver was within the projected timeframe and installation when as per detailed instructions . Good job Team ETrailer, that is why I keep coming back


This was my choice for my flat tow set up on a 2018 Jeep GC. I did this install myself. it was not difficult.



One year in and the wiring set up has worked as planned. no issues.


I have order several things from etrailer. Their products are great. Due to nobody's fault but my own I ordered some wrong things. The return was so easy, no questions asked. I would recommend this company to anybody.


We tow a 2022 Ford Escape behind our Winnebago motorhome. This wiring kit did the job for us. Everything working great!


The install was more challenging than the tow bar itself but we got it done. Be patient with the tail light diodes they are tricky to fit but not impossible. I ended up using some 3m double sided adhesive sticky’s to hold the diodes in place while i pushed the tail light assembly back into position.

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.


I thought I order the 7 to 6 pin wiring harness for my vehicle as I have the 7/6 cord I used when I pulled my pickup. I also ordered the 6 pin mounting bracket with the 6 pin adapter that wires into the harness. I received the kit which is a flat 4 pin harness.

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.


Straightforward install on my Jeep Gladiator and no issues.

1999 Toyota Land Cruiser

everything worked great from the first time I plugged it in

2017 Jeep Grand Cherokee

I’ve used several of these and they always work great.
etrailer videos are a great help!


Install went very well. Instructions were spot on.
Very pleased with results.
Will be ordering more items to improve stability and control on my Class C.

Lincoln MKT

This kit fit perfect on my Lincoln MKT. Made the job so much easier.


Great product. All you need to wire up your vehicle. Good quality.


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.


Work great


Great for towing jeep behind the truck


Simple instructions easy to install

2018 Jeep Wrangler

Fit my 2018 Jeep Wrangler JL, been using it now for a year with no issues.


Great looking product, and fast shipping Thank you

Show More Reviews

See what our Experts say about this Roadmaster Tow Bar Wiring

  • 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
  • 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
  • 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...
  • 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...
  • Can Vehicle with Separate Turn Signals from Stoplights Get Tow Bar Wired as Combined
    Yes, you can use a combined style diode wiring kit like the Roadmaster # RM-154 on a vehicle that has separate taillights like the 2005 Ford Escape. Basically the stop lights of the vehicle will flash like a combined blinker and the amber turn signals won't get used at all.
    view full answer...
  • Is a Converter Needed to Tow an Amber Turn Signal Vehicle Behind an RV
    A converter is not necessary. You can treat the Escort as though it does not have the amber turn signals. They will still function when you drive the Escort, but when you tow it behind the RV the system is simplified to the RV 4 Wire system. There are wiring diagrams towards the bottom of the tow bar wiring kits we have, like part # RM-154. Look for the image labeled Combined RV to Separate Towed Vehicle. I have added a link to a video of a tow bar wiring install on a 2006 Jeep Liberty...
    view full answer...
  • Does Roadmaster Hy-Power Diode Wiring Kit Work on 2023 Jeep Gladiator Mojave Without ParkSense
    So long as you do not have the ParkSense with sensors, your 2023 Jeep Gladiator Mojave is compatible with the diode kit: - Roadmaster Universal Hy-Power Diode Wiring Kit # RM-154
    view full answer...
  • Running Light Function of 2004 Chevy Trailblazer When Flat Towed Using Roadmaster # RM-154
    The Roadmaster Universal Hy-Power Diode Wiring Kit # RM-154 is designed to allow your 2002 Dutch Star Motorhome to power all the lighting of your 2004 Chevy Trailblazer when being flat towed. You should not have the running lights of your Trailblazer turned on independently of the running lights of your motorhome when connected. That could cause the diode to fail but the kit is rated for a max voltage of 24V and max amperage of 85 amps, so it may function even under those conditions.
    view full answer...
  • Tow Bar Lighting Recommendation for a 2015 Ford Edge Titanium
    I checked with Roadmaster and they list the Diode kit part # RM-154 as a fit for your 2015 Ford Edge Titanium so it would fit and work well for you. I attached an install video that shows this tow bar lighting kit being installed on a 2015 Ford Edge for you to check out as well.
    view full answer...
  • Installation Of Roadmaster Tow Bar Wiring For 2011 Ford Flex
    The Roadmaster Tow Bar Wiring, part # RM-154, includes a 30-ft long 4-wire harness so it should reach the rear of your 2011 Ford Flex with no problem. I have attached a link to an installation video you can check out. When running the wiring you want to make sure you avoid any sharp edges or any areas that will become very hot and damage the wiring. The kit includes 3 ft of wire loom that can be used to protect the wiring when you run it beneath your Flex.
    view full answer...
  • What Are Wire Color Functions of Roadmaster Diode Tow Bar Wiring Kit # RM-154
    Sorry to hear about that! We can confirm that the white wire on the 4-way wiring of the part # RM-154 is the ground circuit. The green is right turn/stop, yellow is left turn/stop, and brown is running light.
    view full answer...
  • Do Roadmaster Diode Wiring Kits Allow Backfeeding
    The diodes of the Roadmaster diode kit part # RM-154 that you referenced only allow current to flow in one direction. You would not have to worry about back feeding.
    view full answer...
  • Installation Instructions for Installing a Diode Kit for Tow Bar Wiring
    Sounds like you are trying to use a diode kit like the Roadmaster Diode kit part # RM-154 to install tow bar wiring on a vehicle with separate function taillights. Running the wiring kit to the front turn signal of the tow vehicle wouldn't work because it would only cause the front blinkers to illuminate. This would be pointless since it's the back lights you want to illuminate. The diodes of this kit prevent backfeeding, so the front lights would illuminate but not the back. To see how...
    view full answer...
  • Troubleshooting No Left Turn Signal or Running Lights on 2014 Jeep Grand Cherokee With RM-154
    If everything works but the running lights and turn signal after you installed the Roadmaster Universal Hy-Power Diode Wiring Kit # RM-154 it sounds like you may just have a weak ground; this is often the cause of these types of issues so you'll want to make sure your grounds are securely attached to bare metal surfaces free of any paint, dirt or corrosion of any kind. Also check your wiring thoroughly to ensure there are none that are crimped, broken or otherwise damaged and your connections...
    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...
  • 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...
  • How to Determine the Wiring Functions of a Vehicle to Install Diode Tow Bar Wiring Kit
    To install a diode tow bar wiring kit like the part # RM-154 you will have to use a circuit tester to test the wires that run to the vehicle taillights and then attach the diode wiring by function to them. I attached an install video that shows the process on a somewhat similar Honda for you to check out and get the idea how it's done.
    view full answer...
  • Which Lights Do You Splice Into For Diode Wiring On A Jeep Grand Wagoneer
    The Roadmaster Universal Hy-Power Diode Wiring Kit # RM-154 would splice into the tail lights on the corner of the body and not the lights on the hatch. I've attached a short video below that Jake recently made that will walk you through how to install this kit step by step.
    view full answer...
    Image 1 for
  • How to Wire a 2015 Ford Edge SEL to be Dinghy Towed
    Dinghy wiring the 2015 Ford Edge SEL model is quite a bit different than normal diode wiring because Ford combined the stop, turn and taillight signal on the same wire that goes to the rear facing LEDs in the taillight. To make the # RM-154 kit diodes work properly you will need 2 resistors rated for 50 ohms and 10 watts for LED tail lights or 2 rated for 5 ohms and 10 watts for incandescent tail lights, available from a local electronics supply store. You will also need to wire the diodes...
    view full answer...
    Image 1 for
  • 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...
    view full answer...
  • Wiring Harness For Lighting When Flat Towing 2015 Ram 1500 with Motorhome
    For lighting you can use the bulb and socket kit, # RM-154, and not have to worry about cutting and splicing into the vehicle wiring. This Diode Kit allows you to use your vehicle's tail lights and wiring system while preventing feedback from your motorhome. A 4-Pole flat loop is included to connect your motorhome to the Ram. I have included an installation video of this diode kit for you to check out. The Ram is a 2013 but the installation will be similar.
    view full answer...
  • Center Brake Light/ Third Brake Light Not Working with RoadMaster Universal Tow Wiring Kit RM-154
    Often times the Center High Mount Stop Light (CHMSL) is on its own circuit. So yes, if you wire the kit correctly, you may not have use of your CHMSL when you tow the CR-V. Most of the time, a CHMSL is not necessary when towing. All of the external magnetic kits do not have a CHMSL included. I cannot say for sure however, as laws vary by state. The best way to make sure your rig is legal on the road would be to call your state Department of Motor Vehicles or State Highway Patrol office...
    view full answer...
  • Wire Colors On Roadmaster Universal Hy-Power Diode Wiring Kit
    On the Roadmaster Universal Hy-Power Diode Wiring Kit # RM-154 referenced in your question, the wire colors are as follows: White is for ground. Brown is for tail lights. Yellow is for left brake and turn. Green is for right brake and turn. I have attached an installation video that you can use for reference.
    view full answer...
  • Parts Needed to Wire Lights on a 1999 Chevy Tracker for Towing Behind a Motorhome
    You can use a kit, like RoadMaster Part # RM-154, to wire your 1999 Chevy Tracker. With an amber turn signal vehicle, you can skip those bulbs and use the brake bulbs for both brake and turn functions. Essentially you ignore that the amber turn signals are there and wire the vehicle like you would a trailer. The amber turn signals will still function when you drive the Tracker, but not when it is towed. The second wiring diagram on the RM-154 page shows how you would wire your set up. I...
    view full answer...

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