1. Tow Bar Wiring
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  4. Splices into Vehicle Wiring
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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 etrailer.com or call 800-298-8924 for expert service.
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  • Reviews (4)
  • Q & A (41)
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Roadmaster Tow Bar Wiring - RM-152-98146-7

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

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:  5.0 out of 5 stars   (4 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.

- RM-152-98146-7


- RM-152-98146-7

Very good product, a better price than other online sites and a lot better delivery time. Thank you, will see you guys for the next order. 616897

- RM-152-98146-7
2008 Ford Edge


- RM-152-98146-7
2017 Jeep Wrangler Unlimited

Ordered merchandise was received fast and EXACTLY what I ordered. I will use ETRAILER in the future. Thank you. 464429


Ask the Experts about this Roadmaster Tow Bar Wiring

  • 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...
  • 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...
  • Tow Bar Wiring for 2018 Ford Edge SEL
    There is not a plug-in wiring kit available, but since there is nowhere to put magnetic lights on your 2018 Ford Edge SEL you will have to use a splice-in wiring kit. I recommend the Roadmaster 7-Wire to 6-Wire Kit # RM-152-98146-7. Please keep in mind that since your vehicle has variable voltage tail lights, two 50 ohm, 10 watt resistors will need to be purchased elsewhere for the taillight circuit to work correctly on both SEL and SE models.
    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...
  • How to Keep Battery Charged While Flat Towing a 2015 Fiat 500
    Great question! From what I could find in the owner's manual for a 2015 Fiat 500 (looking both at the Recreational/Flat Towing and Emergency Towing procedures) it does look like you need to keep the steering wheel unlocked while flat towing. Since this means your ignition is on, it can very well drain your battery. I'm not sure why this isn't something that is commonly known because even some of our flat towing manufacturers don't have this info on their site. I reached out to Roadmaster...
    view full answer...
  • Parts Needed to Flat Tow 2020 Chevy Silverado 1500 Diesel
    I checked with Blue Ox and the # BX1736 that you referenced does not have fit exclusions for the diesel engine versions of the 2020 Chevy Silverado 1500 so it would work great for your truck. The Avail Tow Bar part # BX7420 would be a great solution as well. The battery of your truck does need to be disconnected when flat towing it which is why the Roadmaster quick disconnect kit part # RM-766 is recommended as it makes this easier. Your current braking system would work great. For...
    view full answer...
  • Parts Needed to Flat Tow a 2013 Chevrolet Suburban
    I looked in the owners manual for your 2013 Chevrolet Suburban and it can be flat towed or dolly towed, depending on if it's 2 or 4 wheel drive, and if it has a single or two speed transfer case. If you suburban is 2wd or has a single speed transfer case, it can not be towed with all 4 wheels on the ground, and can not be towed with the front wheels on a dolly. So if your Suburban is 4wd with a 2 speed transfer case it can be flat towed (all wheels on the ground) or dolly towed. There...
    view full answer...
  • Does Blue Ox Avail Tow Bar Work With Blue Ox Base Plates for 2019 Ford Ranger
    Yes, the Blue Ox Avail Tow Bar # BX7420 you asked about is absolutely compatible with the Blue Ox base plates that fit your 2019 Ford Ranger, the Blue Ox Base Plate Kit # BX2679. These are two of the parts you'll need in order to flat tow your 2019 Ranger, and to make it simple I'll list them out for you. - Base Plate Kit: Blue Ox Base Plate Kit # BX2679 - Tow Bar: Blue Ox Avail Tow Bar # BX7420 - Wiring Kit: Roadmaster 4-Diode Universal Wiring Kit for Towed Vehicles - 7-Wire to...
    view full answer...
  • Parts Needed to Flat Tow a 2018 GMC Sierra 1500 Behind a Motorhome
    We do have base plates for your 2018 GMC Sierra 1500 but # RM-3180-2 will not fit. The comparable set that will fit your 1500 is # RM-3177-3. This set actually has removable arms so that when you take them out the base plates are essentially invisible. I have linked the installation instructions for you to view. For a compatible tow bar I recommend the Blackhawk 2 # RM-422. This is an all-terrain tow bar which means you will not have to be lined up perfectly straight and level to hook...
    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...
  • Curt Base Plate Kit for Flat Towing 2019 Ford Fiesta
    Since you have a Curt tow bar the base plate kit you'd want for your 2019 Ford Fiesta is the part # C23KR. Now I don't know what other components you are using for flat towing but I'll give you a recommendation just in case they are items that can't easily transfer. Then for wiring the # RM-152-98146-7 would be a great solution. The diode kit that comes with this allows you to splice into the taillight wiring so that your RV controls the vehicle taillights and does not require drilling...
    view full answer...
  • How to Tow a 2019 Jeep Cherokee Behind a Motorhome
    You can flat tow the 2019 Jeep Cherokee if it is a 4x4 model with 2-speed power transfer unit. Models with the 1-speed power transfer unit would have to be put on a trailer. None of the 2-wheel drive models can be flat towed but you can dolly tow front wheel drive models from the front. If you do have a model that can be flat towed and it is a Trailhawk or Overland edition you can use base plates # RM-521451-5. For a compatible tow bar I recommend the Falcon All-Terrain # RM-522. This...
    view full answer...
  • How to Dinghy Tow a 2017 Nissan Versa
    According to page 10-17 in the online version of the owner's manual for your 2017 Nissan Versa, if the vehicle has a manual transmission then it can be flat-towed with four wheels down but if it has an automatic or continuous variable transmission (CVT), it must be towed using a tow dolly under the drive wheels. If you have the automatic or CVT transmission then I recommend the Roadmaster Tow Dolly part # RM-2000-1. This dolly has self-steering wheels to improve maneuvering and electric...
    view full answer...
  • Parts Needed to Flat Tow a 2015 Smart fortwo Behind an RV Using Roadmaster Tracker Tow Bar
    To use the Roadmaster Tracker tow bar # RM-020 with your 2015 Smart fortwo you will need base plates # 52285-1. If you want to be able to remove the crossbar from the tow bar then you would also need to use quick disconnects # RM-201. In addition to the tow bar and base plates there are a few other items needed to properly and safely flat tow the vehicle. First you will need some safety cables, # RM-643. The coiled design helps keep the cables off of the ground. Next you will need...
    view full answer...
  • Mounting Location for Stay and Play DUO Operating Unit
    When I installed the Stay-IN-Play DUO # SM99251 in a 2018 Jeep Grand Cherokee I mounted the operating unit in the front of the engine bay on the core support. You can mount the operating unit anywhere that the wires and hoses can reach; it's just recommended that it mounts in the engine bay away from direct water exposure and extreme heat sources. After installing many flat tow set ups on different vehicles, the biggest piece of advice I can give you is to plan out your install. Take...
    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...
  • Flat Tow Parts For 2019 GMC Acadia
    I looked up the owners manual for you 2019 GMC Acadia and it says that both FWD and AWD models with the 3.6L V6 can be towed with all 4 wheels on the ground. If you have the 2.4L L4 it states that it is not designed to be towed with all 4 wheels on the ground. I recommend that you verify what the owners manual states and verify how your Acadia is equipped. The manual will also outline the procedure of how to put your Acadia into tow mode before your trip. To flat tow your Acadia there...
    view full answer...
  • Differences of Roadmaster Direct Connect and Cross Bar Base Plates for 2020 Jeep Wrangler Unlimited
    The main difference between the Roadmaster direct connect base plate kit (previously known as the EZ5) # RM-521453-5 and the cross bar style base plate kit (previously known as the EZ4) # RM-521453-4 is how the tow bar attaches to the base plate. The cross bar style base plate uses a quick disconnect bar to connect the tow bar up, the direct connect uses pins and clips to mount to the tow bar. They install exactly the same, the arms are the only difference. A direct connection makes...
    view full answer...
  • Recommended Parts to Flat Tow a 2020 Jeep Cherokee Trailhawk
    To tow your 2020 Jeep Cherokee Trailhawk behind a motorhome there are several components you need for a complete, safe set up. The first is a base plate, I recommend Roadmaster direct- connect base plate kit part # RM-521451-5. The base plate bolts to your Cherokee frame and provides the solid attachment point to hook up to. I have installed a variety of base plates on many different vehicles, and Roadmaster's direct-connect is my favorite. I think they install smoother, and have a really...
    view full answer...
  • Does Roadmaster Battery Disconnect Work with Diesel 2020 Chevy Silverado 1500 3.0 Liter
    I checked with Roadmaster and the RM-766 cannot be used with the diesel engines likes what you have in your Silverado. The lighting kit part # RM-152-98146-7 will fit and work great in your 2020 Chevy Silverado 1500.
    view full answer...
  • Recommended Flat Towing Components For A 2017 Ford F-250
    In order to flat tow your 2017 Ford F-250 behind a motorhome, you will need the following items: Base Plate Kit, Tow Bar, Wiring Harness, Safety Cables, Supplemental Braking System, and Possible High-Low Adapter. I have attached my recommendation for each of the following items below. For a base plate kit that will work well for your vehicle, I recommend using the Roadmaster EZ5 Base Plate Kit part # RM-524452-5 as this is Roadmaster's most advanced removable arm base plate kit. You...
    view full answer...
  • Preparing a 2008 Ford Edge for Flat Towing Behind a Motorhome
    According to the owner's manual for the 2008 Ford Edge: Note: If you tow your vehicle with all four wheels on the ground, follow these instructions: -Tow only in the forward direction -Release the parking brake -Place the transmission shift lever in Neutral (N) -Turn the key in the ignition to the ACC position (refer to Starting in the Driving chapter). The ACC position also unlocks the steering wheel. -Do not exceed 65 mph (105 km/h) -Start the engine and allow it to run for...
    view full answer...
  • Parts Needed to Complete a Flat Tow Set Up on a 2018 Jeep JK Wrangler
    To complete your flat tow setup on the 2018 Jeep JK Wrangler along with the Black Hawk tow bar you need the following: Braking System - If your motor home has hydraulic brakes I recommend Demco SBS Stay-IN-Play DUO Supplemental Braking System - Proportional Item # SM99251. This is a proportional braking system which matches the braking pressure applied from the RV , is very easy to use by simply flipping the switch on when ready to tow, can be mounted anywhere on the vehicle, and is...
    view full answer...
  • Completing a Flat-Towing Setup for a 2018 Ford F-150
    Yes, the Blue Ox Base Plate Kit part # BX2671 comes with all the hardware you will need for installation in addition to the safety cables that secure the base plates to the frame. You can see everything that is included with this base plate kit in the attached photo. The Blue Ox Tail Light Wiring Kit part # BX8869 will work for you as long as you do not have LED tailights. You can add a 6-way round trailer connector to this kit with part # PK11609. If you do have LED tailights then I...
    view full answer...
  • Will Roadmaster Diode Tow Bar Wiring RM-154 Work with a 2017 Ford F-150 with LED Tail Lights
    I checked with Roadmaster and they do show the diode kit # RM-154 as a fit for the 2017 Ford F-150. They also show that you can use kit # RM-152-98146-7, # RM-15267, or # RM-15247 as well. I have linked a video showing a diode system being installed on a 2016 Ford F-150 and it will be similar on a 2017.
    view full answer...
  • Recommended Parts Needed to Flat Tow a 2017 Ram 3500 Diesel With an American Heritage RV
    The equipment that you will need to flat tow your 2017 Ram 3500 includes a Base Plate Kit, Tow Bar, Safety Cables, Tow Bar Wiring, a Supplemental Braking System, and most likely a High-Low Adapter. For a Base Plate Kit I recommend using the Blue Ox # BX1989 which will bolt securely to your chassis. The Tow Bar that I recommend going with is the Blue Ox Avail Tow Bar # BX7420 which is rated for 10,000 lbs and comes with Safety Cables. I recommend installing the Roadmaster 4-Diode...
    view full answer...
  • Base Plate Compatible with Jeep Cherokee Trailhawk Elite with Front Bumper Sensors
    Roadmaster base plate kit # RM-521451-5 is confirmed to fit both the Trailhawk and Trailhawk Elite versions of the 2019 Jeep Cherokee. I confirmed with Roadmaster that this base plate works fine with the Technology Group package with the front bumper sensors. For proper fit the vehicle must have factory tow hooks and must not have the Active Air Shutter feature. The other components you'll need to complete your flat towing setup include the tow bar, safety cables, a wiring/lighting solution,...
    view full answer...
  • Parts Needed to Flat-Tow a 2018 Buick Envision
    In order to flat-tow your 2018 Buick Envision with all four wheels on the ground you will need a base plate kit, tow bar, flat-tow wiring harness, safety cables, supplemental braking system, and possibly a high-low adapter. I have attached my recommendations for each of these parts below. For a base plate kit I recommend the Roadmaster EZ5 Base Plate Kit part # RM-523188-5 as it has removable arms which makes for a clean look while not in tow and it will not require a bulky crossbar....
    view full answer...
  • Can 2008 Ford Edge Front Wheel Drive be Flat Towed
    I checked the owners manual of your 2008 Ford Edge and the front wheel drive versions can be flat towed. The Blue Ox base plate # BX2190 that you referenced is a fit for your vehicle and overall is the easiest to use so it's a really great choice. For a tow bar the Avail part # BX7420 is a really great choice that allows the tow vehicle to track well behind the vehicle and also is easy to use as well. For lighting we have the Roadmaster diode kit part # RM-152-98146-7 which comes...
    view full answer...

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Info for this part was:

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