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Roadmaster 4-Diode Universal Wiring Kit for Towed Vehicles - 7-Wire to 6-Wire Straight Cord

Roadmaster 4-Diode Universal Wiring Kit for Towed Vehicles - 7-Wire to 6-Wire Straight Cord

Item # RM-152-98146-7
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Tow Bar Wiring

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RM-152-98146-7 - Tail Light Mount Roadmaster Splices into Vehicle Wiring
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This complete kit includes everything you need to connect your RV's tail, brake, and turn signal lights to your towed car. Diodes prevent feedback and wire your car to operate as a combined system. Includes a 7-way to 6-way straight adapter cord. Lowest Prices for the best tow bar wiring from Roadmaster. Roadmaster 4-Diode Universal Wiring Kit for Towed Vehicles - 7-Wire to 6-Wire Straight Cord part number RM-152-98146-7 can be ordered online at or call 1-800-940-8924 for expert service.
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Roadmaster Tow Bar Wiring - RM-152-98146-7

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

This complete kit includes everything you need to connect your RV's tail, brake, and turn signal lights to your towed car. Diodes prevent feedback and wire your car to operate as a combined system. Includes a 7-way to 6-way straight adapter cord.


  • Complete wiring kit lets you connect your RV's tail, brake, and turn signal lights to your towed vehicle's lighting system
    • Wires towed car as a combined lighting system so that brake and turn signals travel along same wire
  • Diodes prevent electrical feedback and the damage it can cause to your car's electrical components
  • 7-Wire to 6-wire adapter cord allows you to run power from your RV to your towed vehicle
    • Straight cord is ideal for all-terrain tow bars and other tow bars that have channel guides
  • 6-Way socket wires to harness and mounts on towed car with included bracket
  • Sturdy, durable construction
    • Powder-coated aluminum casings protect diodes from corrosion
    • Electrical cord resists water, oil and chemicals
    • Silicone-injected plugs prevent corrosion
  • Kit includes:
    • 4 Hy-Power diodes
    • Wiring harness
    • 7-Way to 6-way adapter cord
    • 6-Way socket with mounting bracket
    • Wire connectors
    • Cable ties
    • 1 Ring terminal
    • 3' Long plastic loom
  • Brake light relay (RM-88400 - sold separately) may be required if used with supplemental braking system
  • Limited Lifetime Warranty


  • Maximum amperage: 85 amps
  • Maximum voltage: 24 volts
  • Adapter cord length: 6-1/2'
    • Wire gauge: 16
  • Wiring harness length: 30'

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.

RM-152 Roadmaster Universal Hy-Power Diode Wiring Kit

RM-98146-7 Roadmaster Wiring - Straight 6 to 7 - 78" Long

Installation Details RM-152-98146-7 Installation instructions

This Product Fits The Following Vehicles

Customer Reviews

Roadmaster 4-Diode Universal Wiring Kit for Towed Vehicles - 7-Wire to 6-Wire Straight Cord - RM-152-98146-7

Average Customer Rating:  4.8 out of 5 stars   (91 Customer Reviews)

This complete kit includes everything you need to connect your RV's tail, brake, and turn signal lights to your towed car. Diodes prevent feedback and wire your car to operate as a combined system. Includes a 7-way to 6-way straight adapter cord.

2013 Subaru Forester

Works as expected. Connection feels solid enough. Have not had the opportunity to take it on a long trip yet.

One thing bit us in the butt, forcing us to cancel a trip at the last minute (when testing that our towed vehicle's turn signals, brake lights and supplemental brake system was working before driving off!): the left-turn signal prong in the male part of the connector (that plugs into the towed vehicle) was not opened enough, so no steady connection was being made because there was no contact between the prong and the walls of the female part. This had worked in a previous test. Picture included. Make sure to use a flathead screwdriver to open each prong up so full contact is made!

2015 Jeep Wrangler

Over-all, the Roadmaster products were great! I watched all videos for install several times. I went through the Jeep frame-rail front-to-back. But I did not loop the wire kit up unto the engine compartment just to cut and splice for the supplemental brake system. I called etrailer and asked whether there was an issue bringing the supplemental wiring directly to 6-wire plug which seemed to be a new concept with no answer either way. This actually worked well and ended up as a cleaner install with fewer cuts/splices


I chose the order by phone option. The website is well organized, but, I had gone too long without hearing another person. I have received several orders from etrailer after purchasing an RV last summer. I knew we would be Purchasing a Toad.
I don’t have any experience with towing another vehicle, so I had plenty of help in finding the right equipment for me.
The delivery times were all easily tracked and arrived in good condition. As md on time.
I had the simple tools required to install the base plate and hitch. The videos available on their site are clear and easy to understand.
I have had a great overall experience with etrailer.

2019 GMC Acadia

Very straight forward install, easy to follow instructions. If you do this your self be prepared, the factory light wiring isn't very long or thick it was difficult to strip the wire back far enough to double it over to get a good connection. Upon completion of the wiring, I double checked all power at both plugs, it was all good, I installed the lights, brake and turnsignals worked great, I didn't have any running lights. About 3 min later they came on and stayed on. I don't believe this has any thing to do with the kit, this vehicle has all kinds of light sensors, darkness sensors, rain sensors.. etc. I believe it just too a min or 2 for the lights to actually come on.

2021 Chevrolet Silverado 1500

I haven’t had time to install this product yet, but I know it’s going to work exactly as the customer service is always superior to get the right parts sent.

Finally got my lights working properly after installing this product. Haven’t had any problems at all.
Lamonte M - 04/30/2022

Toyota Tacoma

I had a Toyota Tacoma that has separate blinker lights. Took a mechanic that was knowledgeable in electrical wiring. Followed the instructions and it worked perfect. Used it several times since


Works as designed but wish i would have got the curly cord vs the straight cord between my Entegra and jeep

While we do not have the coiled adapter with the diode kit, we do carry it as a separate part. It is part # RM-146-7
Roadmaster 7-Wire to 6-Wire Flexo-Coil Kit
-- Etrailer Expert Jenny N - 04/02/2022


Knowledgeable people. On time delivery. Great products.


Had it installed by my RV Service guy, and it’s worked great for us in towing our Jeep Cherokee with the Roadmaster Falcon 2 towing system!


The kit contained all I needed and their on line video for installation in a 2015 Kia Soul was excellent. Hardest part was routing the wires to the back of the car, but overall it was much easier that I thought


Very good quality, video and instructions very informative. But, I still cannot figure out where to mount the six pin bracket. Also, no self tapping screws…

I will have our customer service team reach out to you in regard to the missing self tapping screws. The harness does come with a mounting bracket that can allow you to attach to the fascia or bumper on the front of the truck. You can use the video below as reference on a 2020 Chevy Colorado,
-- Etrailer Expert Jenny N - 10/29/2021


Products arrived earlier than was expecting. Haven't had a chance to install just yet, but I am looking forward to that process. etrailer has been very easy to work with and very knowledgeable about the different products that are available for my project.


Great service. Knowledgeable people to help you get the right product's. This is my second opportunity to use this company. It was great both times. I wish more online companies were this great to do business with.


Everything works amazing
Thanks to all
at etrailer


Package arrived with everything needed to wire my lights on my Towed Vehicle and
Instructions were very easy to Follow
Thank You


Has worked flawlessly

2021 Chevrolet Silverado 1500

Love the videos Etrailer provides!


Easy to follow instructions with quality parts.


everything i needed in one package.


Works really well and easy to hook up


Great customer service!


I am very happy with the Roadmaster wiring kit. I was worried about cutting into the taillight wiring on our 2017 Grand Cherokee but the directions were very clear and worked just as advertised. It has been a good year traveling in our coach to 11 states towing our Jeep. A lot more RVs on the road, hope they make more campgrounds to accommodate the increase. etrailer is the best !


Great to purchace from with great perso nal

2021 Jeep Wrangler Unlimited

Great Product and fast shipping as usua l!


Received in good time everything is the re.

Show More Reviews

Ask the Experts about this Roadmaster Tow Bar Wiring

  • How Long Does It Take A Shop To Install Roadmaster 4-Diode Harness In A 2018 Jeep Grand Cherokee?
    A shop that is familiar with installing towed vehicle wiring harnesses such as the Roadmaster 4-Diode Universal Wiring Kit # RM-152-98146-7 should be able to install it on your 2018 Jeep Grand Cherokee in a few hours without a problem. You will however want to reach out to the shop directly to see how long they tell you to expect the install to take, as they are the best judge of their own skill set. If you have not already picked out a shop you want to install the harness for you then...
    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...
  • Should Install of Roadmaster Diode Tow Bar Wiring Kit for 2022 Ford Escape Wire as Combined
    The trailer wiring of your 2022 Winnebago View would already have the stop lights and turn signals combined on the same circuit. Since separate vehicles can be wired as combined and combined is the easiest that's how I would recommend installing the # RM-152-98146-7.
    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...
  • Tow Bar Wiring Recommendation for Flat Towed 1986 Jeep Cherokee
    For operating the taillights of your 1986 Jeep Cherokee when flat towed you'd want a diode kit like the part # RM-152-98146-7 which comes with everything you'd need to connect to the 7-way at the rear of your RV.
    view full answer...
  • Tow Bar Lighting Kit for Flat Towing Fiat 500 C Pop
    For flat towing your Fiat 500 C Pop we have the Roadmaster diode kit part # RM-152-98146-7 which would work great. This is a diode kit that installs into the towed vehicle wiring and allows your Sprinter RV to easily control it's lighting when being flat towed. If you need other components to flat tow your Fiat let me know the year model you have and I can recommend what you'd need.
    view full answer...
  • Can Trailer Wiring of 2022 Chevy Equinox Work as Tow Bar Wiring
    Trailer wiring can not be used as tow bar wiring as the converter does not allow the wiring to basically work in reverse. I wish it was the simple and convenient but tow bar wiring will have to be totally different from trailer wiring. What you'd want is a kit like the Roadmaster # RM-152-98146-7 which uses diodes to connect to your 2022 Chevy Equinox. I attached an install video for this kit on a similar 21' Equinox for you to check out as well.
    view full answer...
  • Can the Roadmaster Kit # RM-152-98146-7 Run Through the Side Channel of Falcon All Terrain II
    The wiring for the Roadmaster 4-Diode Universal Wiring Kit # RM-152-98146-7 that you referenced will feed through the side channel of your Falcon All-Terrain II but if you are needing more length than the 6-1/2' cord I have another solution for you. The Roadmaster Diode 7-Wire to 6-Wire Flexo-Coil Wiring Kit # RM-15267 is the exact same thing except that it has a coiled cord instead of a straight one. The coiled design keeps it from dragging on the ground when you are flat towing. When...
    view full answer...
  • Recommended Wiring Kit for Flat Towing 2020 Ram 1500 Behind RV
    For your 2020 Ram 1500 I really like the Roadmaster Diode Flexo-Coil Wiring Kit # RM-15267, which includes everything you need to wire up the truck so that its tail lights accept the signal lights from the RV during travel. You will use it to tap into the tail light circuits on your Ram and it includes a 6-Way connector that gets mounted to the front bumper, along with enough coiled wiring to go from there to the 7-Way on the motorhome. If your tow bar has accommodations for the wiring...
    view full answer...
  • Does InvisiBrake Supplemental Braking System for Towed Vehicle Cover Lighting Functions
    We can help with a way to activate the taillights of your 2012 Honda CR-V when it's being flat towed but the supplemental braking kits like the InvisiBrake part # RM-8700 are not designed provide that function. What you would need for that is the # RM-152-98146-7 which comes with everything needed to control the taillights of the CR-V with you tow vehicle.
    view full answer...
  • Lighting Solution for 2006 Saturn Vue Flat Towed by Motorhome
    You do need a lighting solution installed on your 2006 Saturn Vue to allow the taillights of it to be controlled by your motorhome when it's being flat towed. For that we have the # RM-152-98146-7 which wires into your taillight wiring and allows the motorhome to control them and comes with all of the wiring, diodes, and connectors needed.
    view full answer...
  • Recommended Wiring Kit For A 2001 Jeep Wrangler Sport TJ
    For your 2001 Jeep Wrangler Sport TJ I recommend the Roadmaster 4-Diode Universal Wiring Kit for Towed Vehicles - 7-Wire to 6-Wire Straight Cord Item # RM-152-98146-7. This complete kit includes everything you need to connect your RV's tail, brake, and turn signal lights to your towed car. Diodes prevent feedback and wire your car to operate as a combined system. It is a one time setup that will allow you to easily hook up and go instead of running magnetic lights to the back of your Jeep...
    view full answer...
  • Why Do You Disconnect The Negative Battery Cable On A 2020 Buick Encore GX When Flat Towing
    The 2020 Buick Encore GX needs to have the battery disconnected while flat towing the vehicle per manufacturer instructions. This is to ensure the safety of your vehicle's components. Typically this is to prevent the steering wheel from locking and causing your tires to drag anytime you make a turn. To make this as simple as flipping a switch you can install the Roadmaster Automatic Battery Disconnect with Switch for Towed Vehicle w/ Supplemental Braking System # RM-766. This will allow...
    view full answer...
  • Do You Need To Disconnect The Battery On A 2019 Cadillac Escalade While It Is Flat Towed
    I have a solution for you. Even if you have a charge line to your battery in the 2019 Escalade, there is a risk that the motorhome will actually drain the battery when the Escalade gets to low on power. I recommend using the Roadmaster Automatic Battery Disconnect with Switch for Towed Vehicle w/ Supplemental Braking System # RM-766. It is going to give you the easiest disconnect, just a push of a button. When you are ready to restore power just put the button again. You will still need...
    view full answer...
  • 4 Diode Tow Bar Wiring Kit for 2009 Chevy Silverado
    The Blue Ox 4 diode kit part # BX8848 that you referenced is a fit for your 2009 Chevy Silverado to use as tow bar wiring. We do have the kit part # RM-152-98146-7 also that comes with everything you need including a connectors for the front of the tow vehicle and a cable to connect accross the tow bar. This is the more complete solution that I would recommend over the Blue Ox.
    view full answer...
  • Can Standard Tow Bar Diode Kit fit 2020 Jeep Wrangler
    For your 2020 Jeep Wrangler you can use a standard diode kit like the part # RM-152-98146-7. You do not need anything different for the lighting setup that you have.
    view full answer...
    Image 1 for
  • Tow Bar Wiring Kit for 2021 Jeep Gladiator that is Flat Towed
    For your 2021 Jeep Gladiator there aren't any custom fit tow bar wiring kits available so you'd have to go with a diode type kit like the part # RM-152-98146-7 which we've had the chance to install on a 2020 Jeep Gladiator and made an install video for which you can use as an install guide to walk you through the process.
    view full answer...
  • Flat Tow Wiring for 2020 Hyundai Palisade
    When using a car dolly, such as the Demco Kar Kaddy SS, # DM9713045, one generally uses the included lighting package for the indicator lights, plugging into the tow vehicles flat 4 plug or RV style 7-way. However, it is possible to use the same wiring harness for flat towing a vehicle instead, using vehicle indicator lights instead of the tow dolly's. Because they use the same tow vehicle/RV plug, it is one or the other. Since the 2020 Hyundai Palisade is not able to be flat towed, there...
    view full answer...
  • How Does Diode Tow Bar Wiring Kit Work Installed on 2016 Nissan 370Z with Separate Taillights
    You can wire up a vehicle that has separate turn signals from stoplights as a combined setup when you install tow bar wiring. Basically you'll use the diodes to run both circuits to the stoplights of the vehicle which will allow them to illuminate when the brakes are applied and also flash when the blinker is on. For a kit that comes with everything and would work great you'd want the Roadmaster diode kit part # RM-152-98146-7.
    view full answer...
  • Fit and Compatibility of Roadmaster Diode Wiring Kit on 2020 Jeep Cherokee
    The Roadmaster Diode 7-Wire to 6-Wire Flexo-Coil Wiring Kit # RM-15267 is basically the same as the # RM-152-98146-7 with the only difference being the coiled connection cable versus a straight cable. You can absolutely use the # RM-15267 on your 2020 Jeep Cherokee. It is confirmed to fit and work the same way.
    view full answer...
  • Video Showing Roadmaster Flat Towing Taillight Wiring Being Installed on 2017 Jeep Grand Cherokee
    We don't have a video specifically for the # RM-15247 installation on a 2017 Jeep Grand Cherokee, but we do offer a video showing the almost identical # RM-152-98146-7 being installed on a 2018 Grand Cherokee. The consecutive model years of the vehicles and the fact that the harnesses are almost exactly alike means that the video will be very helpful, the procedure for the # RM-15247 on a 2017 Jeep GC will be identical to what's shown in the video I've linked for you.
    view full answer...
  • Diode Lighting Kit for 2019 Chevy Suburban & Does Battery Need to be Disconnected
    Let's start with the lighting kit for your 2019 Chevy Suburban, and there are diode wiring kits available. The best option due to its reliability is going to be from Roadmaster, the Roadmaster 4-Diode Universal Wiring Kit for Towed Vehicles - 7-Wire to 6-Wire Straight Cord # RM-152-98146-7. In regards to your battery, it does need to be disconnected in order to flat tow your Suburban, so what you will need is the Roadmaster Automatic Battery Disconnect with Switch # RM-766. What this...
    view full answer...
  • Can You Splice Into the Wiring for Flat-Tow Lights On a 2019 GMC Acadia Denali
    I checked with Roadmaster (the leader in flat-tow equipment) and you can indeed splice/tie into the tail light circuits on a 2019 GMC Acadia (All Models Including Denali) for flat-tow lights. The best option we have for this is the Roadmaster 4-Diode Universal Wiring Kit for Towed Vehicles part # RM-152-98146-7 which has didoes that will protect the vehicle in the event of a short. It comes with everything you need.
    view full answer...
  • Recommended Tow Bar Wiring Kit For A 2017 Lincoln MKZ
    When it comes to installing the tow bar wiring on your 2017 Lincoln MKZ The Roadmaster 4-Diode Universal Wiring Kit for Towed Vehicles - 7-Wire to 6-Wire Straight Cord # RM-152-98146-7 is the correct kit you would need. This kit is for a RV with a 7 round adapter and will make the Lincoln MKZ mirror the turn, stop and tail lights of the motor home. If your motorhome has a 4 flat connector you would need The Roadmaster Universal Hy-Power Diode Wiring Kit # RM-154. The # 118591 is used...
    view full answer...

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