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-Way to 6-Wire Hybrid Cord

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

Item # RM-152-1676-7
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Our Price: $187.57
Tow Bar Wiring

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RM-152-1676-7 - Diode Kit Roadmaster Splices into Vehicle Wiring
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Perfect for tow bars with built-in channels, 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. Lowest Prices for the best tow bar wiring from Roadmaster. Roadmaster 4-Diode Universal Wiring Kit for Towed Vehicles - 7-Way to 6-Wire Hybrid Cord part number RM-152-1676-7 can be ordered online at etrailer.com or call 800-298-1624 for expert service.
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  • Reviews (16)
  • Q & A (21)
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Roadmaster Tow Bar Wiring - RM-152-1676-7

  • Diode Kit
  • Splices into Vehicle Wiring
  • Universal
  • Roadmaster
  • 30 Foot Long Harness

Perfect for tow bars with built-in channels, 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.


  • 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
    • Hybrid cord is ideal for all-terrain tow bars and other tow bars that have channel guides
    • Coiled end connects to RV and prevents cord from dragging and tangling
    • Straight end connects to towed vehicle and is ideal for tow bars with 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: 8'
    • 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.

152 Roadmaster Universal Hy-Power Diode Wiring Kit

1676-7 Roadmaster Coiled-to-Straight 7- to 6-Wire 8' Power Cord

910030-5 Electrical Socket Bent Bracket - Roadmaster

910030-7 RoadMaster 6-Wire Trailer Connector - Vehicle End

This Product Fits The Following Vehicles

Customer Reviews

Roadmaster 4-Diode Universal Wiring Kit for Towed Vehicles - 7-Way to 6-Wire Hybrid Cord - RM-152-1676-7

Average Customer Rating:  4.8 out of 5 stars   (16 Customer Reviews)

Perfect for tow bars with built-in channels, 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.

- RM-152-1676-7
by: 04/08/2021

So far so good. Self installed on 2018 Ford F150. RV side was a breeze. Written instructions are weak. The truck side included economy wiring kit which required cutting tailight and brakelight wires in order to tap diods into lines. If doing it again, I would order the Hopkins custom wiring kit HM56009. It doesn't require cutting wires. It plugs into factory connections.

- RM-152-1676-7

Wow!!! So very impressed with this company!!’ Haley helped me by phone make sure everything I ordered was right for my RV and Smartcar (tow bar, base plate, battery shutoff and wiring). It came quick and the quality of the products (Blue Ox) are outstanding. Highly recommend this company!! Thank you for helping me!!

- RM-152-1676-7

It is working very well. I would recommend it.

- RM-152-1676-7

worked as stated

- RM-152-1676-7

Product arrived quickly and was well packaged. Will install soon.

- RM-152-1676-7

Excellent help and support from Jane.

- RM-152-1676-7
2021 Jeep Cherokee

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2019 Jeep Cherokee

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Ask the Experts about this Roadmaster Tow Bar Wiring

  • Diode Tow Bar Wiring Kit Recommendation for 2020 Ram 1500
    While you do have a separate taillight setup since your turn signals are on a different circuit from your stoplights you can still wire up your 2020 Ram 1500 for tow bar wiring like a combined circuit and it will work just fine and be totally legal. The red bulbs of your stoplights would just blink with the turn signals like a combined vehicle. The # RM-152-1676-7 that you referenced comes with everything you'd need so it would be the best overall setup and would work great too with the...
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  • How Does 6-Way Tow Bar Wiring Socket Attach to Vehicle Typically
    We don't recommend attaching wiring sockets to base plate kits directly since that would normally require drilling into it and would void the warranty. The part # RM-152-1676-7 comes with a bracket that we would recommend you attach to the bottom of the bumper of your vehicle. I believe you have a Jeep Wrangler so I attached an install video for this kit on a similar 2018 Jeep Wrangler Unlimited.
    view full answer...
  • Parts Needed to Install Tow Bar Wiring on Vehicle Towed on Tow Dolly
    You'd need the tow bar diode wiring kit part # RM-152-1676-7 installed on your 2018 Honda Pilot Touring and then an additional 7-way socket wired into your motorhome wiring like with the # PK11998 and the socket # PK11893 and you'd be set. You'd need to use the harness to tap into the correct circuits of your 7-way wiring to do this.
    view full answer...
  • Recommended Tow Bar Base Plate Kit For 2021 GMC Canyon AT4
    I reached out to my contact at Roadmaster and she confirmed that the Roadmaster Direct-Connect Base Plate Kit # RM37VR you were looking at will work on just fine your 2021 GMC Canyon AT4. The Roadmaster Nighthawk All Terrain, Non-Binding Tow Bar w/ LED Lights # RM-676 you mentioned will work perfectly with the Roadmaster # RM37VR, and the safety cables that your Nighthawk came with will also still work. To complete your flat-tow setup you will need wiring, and a supplemental system. For...
    view full answer...
  • Flat Towing Components Recommended for 2020 Jeep Wrangler
    For your 2020 Wrangler JL the complete list of parts I recommend to allow you to safely tow your Jeep is: -Roadmaster Direct-Connect Base Plate Kit - Removable Arms # RM-521453-5 which are a custom fit. -Roadmaster Falcon 2 Tow Bar - Motorhome Mount - 2" Hitch - 6,000 lbs # RM-520 -RoadMaster 68" Single Hook, Coiled Safety Cables - 6,000 lbs # RM-643 -Roadmaster 4-Diode Universal Wiring Kit for Towed Vehicles - 7-Way to 6-Wire Hybrid Cord # RM-152-1676-7 which will use your factory...
    view full answer...
  • jFlat Towing 2016 Jeep Wrangler Unlimited behind 2020 Holiday Rambler Motorhome
    It sounds like you have your system spec'ed out about perfect. The Roadmaster # M-676 Nighthawk All-Terrain tow bar will connect your 2020 Holiday Rambler to your 2016 Wrangler Unlimited if it has a Roadmaster EZ5 Base plate Kit # RM-521448-5 installed. You may need a tow bar adapter to match the hitch height with the tow bar when level or within 3 inches. An example is the Blue Ox # BX88130 +/- 6” adapter. I have attached a link to all of our adapters and a link to an FAQ article...
    view full answer...
  • Base Plates for 2021 GMC Canyon Diesel Without Adaptive Cruise Control & Blue Ox Tow Bar
    We do have base plates that you can use with your 2021 GMC Canyon with a diesel engine and no adaptive cruise control, as well as tow bar wiring. The correct base plates for your truck are from Demco: - Demco Tabless Base Plate Kit - Removable Arms # DM9519319 These base plates will ensure your Canyon keeps it's clean look due to their removable arms, and they are compatible with a Blue Ox tow bar like the Blue Ox Avail # BX7420, for example, but will require an adapter, the Adapter...
    view full answer...
  • Second Vehicle Demco Air Force One Kit for 2021 Chevy Traverse Flat Towed
    When installing the Demco Air Force One on a new vehicle we actually have the second vehicle kit part # SM99209 which comes with everything needed for just the new vehicle. You most likely could take the tow bar lighting kit from the old vehicle and install on the new Traverse but otherwise you could go with # RM-152-1676-7 for a new diode setup with everything needed. This would work great with the Blue Ox base plate you are planning on getting part # BX1734 and Blue Ox tow bar like...
    view full answer...
  • Flat Tow 2019 Buick Envision Set Up
    You asked about Blue Ox and Roadmaster complete systems but set ups to flat tow a vehicle are an a-la-carte situation where the user picks the pieces that they prefer based on features and value. In my recommendation below I have parts from several companies. Personally, where value is equal, I prefer to use one brand mainly. In this case, Roadmaster, as they carry many of the pieces we need and I can be assured that they will work together well. To flat tow your 2019 Buick Envision...
    view full answer...
  • Blue Ox Base Plate Fit for 2018 Nissan Frontier
    We do have Blue Ox base plates that fit your 2018 Nissan Frontier, but not confirmed to fit means the base plates you referenced will not physically fit on the frame of your Frontier, the model number you referenced, for example, is a fit for a 2010 - 2012 Ford Fusion. So for base plates, a tow bar and the rest of the parts needed to flat tow your 2018 Nissan Frontier, here is exactly what you will need that will fit your truck. - Base Plate Kit: Blue Ox Base Plate Kit # BX1843 -...
    view full answer...
  • Flat Towing A 2021 Chevrolet Silverado 1500 4x4
    Digital odometers only work when the vehicle is on and power is running to the odometer. Since you'll have to remove the negative battery cable to flat tow your 2021 Chevy Silverado there will be no power running to the odometer for it to account for any miles traveled. If you're needing the equipment to flat tow your 2021 Chevy Silverado 1500 4x4 I have the following recommendations for you: Base Plates: # RM-523199-5. These base plates are a confirmed fit and will has brackets...
    view full answer...
  • Flat Tow Set Up For 2019 Mini Cooper Convertible S
    There are few items you are going to need to flat tow your 2019 Mini Cooper behind your 2020 Tiffin Wayfarer. The following is what you will need to set the vehicle up: Blue Ox Base Plate Kit Item # BX1312. This base plate is a custom fit base plate. Steele construction and attaches to the chassis of the vehicle to provide a solid connection point for the tow bar. It is compatible with the Mini Cooper convertible and convertible S. It has removable tabs so the front of the vehicle looks...
    view full answer...
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  • Items Needed To Flat Tow A 2021 Jeep Gladiator
    To flat tow your 2021 Jeep Gladiator I recommend the following items: Roadmaster Direct-Connect Base Plate Kit Item # RM-521453-5. The tabs are removable to maintain a clean look on the front of the vehicle when not towing. It connects to the chassis of the vehicle to give the tow bar a solid connection point. Blue Ox Patriot 3 Radio Frequency, Portable Braking System Item # BRK2019. This braking system can be used in multiple vehicles within the household if needed. It is also compatible...
    view full answer...
  • Can a 2015 VW Jetta 1.8 CL Be Flat towed
    While many vehicles will have base plates and other components available, only some trim levels are able to be safely flat towed. The OEM is final word on what conditions are needed and what trim levels can be safely towed. We always recommend that you review your vehicle specific owners manual for this information as the OEM is the authority on if a vehicle they manufactured can be safely towed and how. If you can tow your particular vehicle, you'll need base plates, safety cables,...
    view full answer...
  • Best Parts to Flat Tow 2021 Subaru Crosstrek With Manual Transmission
    According to the owner's manual I looked up, there are no restrictions regarding flat towing your 2021 Subaru Crosstrek with manual transmission. All you will need are the right parts in order to flat tow your Crosstrek, and I'll list out the best ones below to make it easier for you to order. - Base Plate Kit: Roadmaster Direct-Connect Base Plate Kit # RM-52927-5 - Tow Bar: Roadmaster Falcon All Terrain, Non-Binding Tow Bar # RM-522 - Safety Chains: Roadmaster 80" Coiled Safety...
    view full answer...
  • Can Demco SBS Air Force One Supplemental Braking System Be Installed On 2020/2021 Chevrolet Blazer?
    The Demco SBS Air Force One Supplemental Braking System for Motor Homes with Air Brakes # SM99243 on your RV is confirmed to work with the 2020 and 2021 Chevrolet Blazer, and if you do decide to buy one you will simply need the Demco SBS Reinstall Kit for Air Force One Supplemental Braking System # SM99226. You will need to transfer the air cylinder, air cylinder brackets, and operating unit will need to be transferred from your current vehicle to the Blazer. To complete the flat...
    view full answer...
  • Outlet Kit and Tow Bar Lighting for 2018 Ford C-Max
    If you were looking for an outlet kit to use with the Brake Buddy Select part # HM39524 you could use the # RM-9332 or if you were looking for a lighting kit the Roadmaster diode kit part # RM-152-1676-7 comes with everything needed to control your C-Max's taillights.
    view full answer...
  • Tow Bar Wiring for 1997 Honda CR-V
    To flat tow your 1997 Honda CR-V the wiring kit you'd want the Roadmaster Diode kit part # RM-152-1676-7 which wires into CR-V and allows you to control the taillights. It comes with the wiring that runs across the tow bar to attach to the motorhome connector as well. The kit you referenced is for attaching to a trailer.
    view full answer...
  • Can Gen-Y Torsion Ball Mount Be Used To Flat Tow 2021 Jeep Wrangler and Carry Stow Away Box?
    I would be happy to help! The Gen-Y Torsion 2-Ball Mount w/ Stacked Receivers - 2" Hitch - 5" Drop/Rise - 10,000 lbs # 325-GH-1024 is a great option for attaching the Blue Ox Avail Tow Bar # BX7420 to your 2021 Tiffin Wayfarer with a 2" receiver, and it will give you a smoother ride. With that said a standard non-cushioned ball mount like the # 325-GH-324 would be just fine, as the torsion-flex technology would be a bit over kill for what you are wanting to do. This option would would...
    view full answer...
  • How To Flat Tow A 2011 Nissan Sentra Manual On All Four Wheels
    I checked the online version of the owner's manual for your 2011 Nissan Sentra 5 speed manual. I recommend checking your manual as well, but Nissan states that it can be towed with all four wheels on the ground as long as the ignition is off, the steering wheel is secured in the straight-ahead position with rope or device (factory wheel lock is not sufficient), and the shift selector is in neutral. Here are the parts that I recommend going with in order to properly flat tow your 2011...
    view full answer...
  • Recommended Flat Towing Equipment For A 2004 Jeep Grand Cherokee
    From the picture you provided it looks like you have the Roadmaster Crossbar-Style Base Plate Kit - Removable Arms Item # 1425-1. To get replacement arms for it you'll need to fill out the form that pops up when you click on the "installations details" link of the Roadmaster Replacement Arms for Base Plate Kits Item # RM-ARMS and send it into Roadmaster. To flat tow your 2004 Jeep Grand Cherokee you'll also need a tow bar, tow bar wiring kit, braking system, and safety cables. I have...
    view full answer...
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Info for this part was:

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