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Roadmaster Smart Diode 7-Wire to 6-Wire Wiring Kit for Variable Voltage LED Tail Lights

Roadmaster Smart Diode 7-Wire to 6-Wire Wiring Kit for Variable Voltage LED Tail Lights

Item # RM38FR
Our Price: $203.35
Tow Bar Wiring

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RM38FR - Universal 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 vehicle with variable voltage lights while flat towing. 7-Wire to 6-wire cord and 6-way car-side socket included for easy hookup. Great Prices for the best tow bar wiring from Roadmaster. Roadmaster Smart Diode 7-Wire to 6-Wire Wiring Kit for Variable Voltage LED Tail Lights part number RM38FR can be ordered online at etrailer.com or call 1-800-940-8924 for expert service.
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  • Reviews (28)
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Roadmaster Tow Bar Wiring - RM38FR

  • Diode Kit
  • Splices into Vehicle Wiring
  • Universal
  • Roadmaster

This complete kit includes everything you need to connect your RV's tail, brake, and turn signal lights to your vehicle with variable voltage lights while flat towing. 7-Wire to 6-wire cord and 6-way car-side socket included for easy hookup.


Features:

  • Complete wiring kit lets you connect your RV's tail, brake, and turn signal lights to your towed car's lighting system
  • Smart diodes ensure that your variable voltage, LED tail lights function as they should while your car's being towed
    • Converts the 12V signal from your RV's wiring to a 9V signal so your tail lights work as intended
    • Prevents electrical feedback that can damage your vehicle's electrical components
  • 7-Wire to 6-wire Flexo-Coil adapter cord lets you easily run power from your motorhome to your towed vehicle
    • Expands out to 8' to prevent dragging and tangling
    • Resistant to water, oil, and chemicals and has silicone-injected plugs to prevent corrosion
  • 6-Way socket wires to harness and mounts on towed car with included bracket
  • Powder coated aluminum casing on diodes is corrosion resistant and provides protection from the elements
  • Kit includes 2 smart diodes, wiring harness, split loom, ring terminals, zip ties, 7-wire to 6-wire adapter cord, 6-way socket with mounting bracket, and 10' of 14-gauge wire
  • Brake light relay (RM-88400 - sold separately) may be required if used with supplemental braking system
  • Assembled in the USA


Specs:

  • Maximum amperage: 5 amps
  • Maximum voltage: 16 volts
  • Wiring harness length: 27'
  • 14-Gauge wire length: 10'
    • Maximum power rating: 60 volts
    • Operating temperature: 40 F to 176 F
  • Coiled cord max length: 8'
  • Coiled cord retracted length: 15"
  • Limited lifetime warranty


This complete smart diode wiring kit lets you connect your RV's tail, brake, and turn signal lights to your towed car's lighting system so that you'll have the signal lights necessary for flat towing your vehicle.


Because your vehicle has variable voltage tail lights, you cannot use a standard diode wiring kit to get these signal lights. If regular diodes are used on a vehicle that has variable voltage tail lights, the bulbs will light up as though the towed car is braking whenever the tail lights are on. In other words, there will be no difference between your vehicle's brake lights and running lights. This is because variable voltage tail lights use the same wire to power both the brake lights and tail lights. They do this by using a 12-volt signal for brake lights and a 9-volt signal for tail lights.


Smart diodes correctly modulate the 12-volt signal coming from your RV to activate only the intended circuit. The result is that your vehicle's tail lights will look and function as intended.


This wiring kit includes everything you need to hook up your motorhome's electrical to your towed car. It is designed to work with LED lights only. If your vehicle has incandescent lights, you'll need to use the smart diode kit designed for incandescent tail lights (RM26FR - sold separately) instead.


If your RV has separate tail light wiring, wherein the brake and turn signals run on separate wires, you'll need a wiring converter (RM-732 - sold separately) to complete this installation.


Smart Diode Wiring Diagram


153789 Roadmaster Wiring Kit w Smart Diodes for LED Bulbs

02427 14-Gauge Brown Primary Wire

146-7 Roadmaster Adapter 7 to 6 Wire Flexo-Coil Cord

Installation Details RM38FR Installation instructions

This Product Fits The Following Vehicles




Customer Satisfaction Score:


Customer Reviews

Roadmaster Smart Diode 7-Wire to 6-Wire Wiring Kit for Variable Voltage LED Tail Lights - RM38FR

Average Customer Rating:  4.9 out of 5 stars   (28 Customer Reviews)

This complete kit includes everything you need to connect your RV's tail, brake, and turn signal lights to your vehicle with variable voltage lights while flat towing. 7-Wire to 6-wire cord and 6-way car-side socket included for easy hookup.

by:
Chevrolet Equinox

I purchased this as part of a package which included; Hitch and wiring for my 2022 Equinox, Base plate, Tow Bar, brake System and connecting air hose, break away cables, LED tow lights with wiring harness, and a trickle charger to keep the Equinox battery from going dead while I was towing it behind my class A RV.
I had etrailer do the install of all the components on my car and RV. All the workmanship was excellent and done in the amount of time they said it would take. Also because they did not have a video of this equipment being put on this year and model vehicle, I gave them permission to make a video(which added a extra day and a half to the install)and the installation was free. Everything has worked perfectly and I couldn't be happier. Etrailer is my go to for anything towing and also RV parts.



by:

Works well and east to install just time consuming for layout, placement and overall cleanliness for super SANO install. The timing of installing this and the DUO Plug in Play must be done simultaneously. Layout the DUO first for placement locations and wire runs then this lighting wire run from front connection to rear area, then start at the front and make the connections from front to rear in one pass. Worked perfectly first time. Install fuses last.



by:

AS ALWAYS IT WAS EASY



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I ordered an in stock item on Thursday but did not receive it until 9 days later. Maybe I didn't order it correctly to receive it sooner. I don't think a picture will show the products on my vehicle. That is a great thing!



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2022 Ford F-150



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2020 Lincoln Navigator



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A very easy installation. The instructions and kit quality were very good. I installed this kit on a 2019 Chevy Spark that I tow behind an RV. The lights have never failed to work as expected. I would highly recommend this product.



by:

Great company to purchase from. Very fast delivery.



by:

Great product!!



by:

Works like towing a trailer, The wiring was a challenge and the E-Trailer video on installatios was very helpful



by:

This is to rig my third vehicle for flat towing behind our motorhome. I am sure that the e-trailer people will be available to help me if I need advice.



by:

Installation went very well with the help of the video on your website. Thanks.



by:

Great service .I had a problem with a part they sent a new one and it worked great.Would recommend.



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Work as advertised - no issues



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Show More Reviews

See what our Experts say about this Roadmaster Tow Bar Wiring

  • Steps Needed To Get Your 2023 Chevy Equinox Ready To Flat Tow
    To get your 2023 Chevy Equinox ready to flat tow you'll need to complete the following steps: 1. Position the vehicle to be towed and secure it to the towing vehicle. 2. Start the vehicle. 3. If equipped with AWD, engage the AWD system and confirm that it is on. 4. Move the shift lever to N (Neutral). 5. Then, put the vehicle into accessory mode by pressing ENGINE START/STOP one time without the brake pedal applied. An amber light will appear in the button when in accessory mode. The...
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  • Does The Curt Baseplate Work With A 2023 Chevy Equinox Premier With Lower Active Air Shutters
    The Curt Custom Base Plate Kit # C28FR doesn't have any notes listed stating that it will interfere with the lower active air shutters on your 2023 Equinox Premier. If it does the shutters can be trimmed or removed to allow for the baseplate to fit. One of our installers, Brad, has a done this more times than I can count since the Chevy Equinox is a popular choice for flat towing. If you haven't picked out the rest of your flat towing components then I have the following recommendations: Tow...
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    We can get you set up to flat tow your 2021 Ford F-150, and you will need a number of parts, including base plates, in order to do so, though you do already have one with the Roadmaster Falcon All Terrain, Non-Binding Tow Bar # RM-522. Along with the Roadmaster base plates you mentioned, the other things you will need are safety chains (if you don't have them), as well as a wiring kit, brake light relay, and supplemental braking system. I'll go ahead and list out the parts for you to make...
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  • Recommended Parts to Flat Tow a 2021 Chevy Tahoe Premiere
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  • Recommended Flat Towing Components For A 2016 Ford Fusion Energi
    To flat tow your 2016 Ford Fusion Energi you'll need the following components: Baseplate: Roadmaster Direct-Connect Base Plate Kit # RM-524437-5. Tow Bar: etrailer SD Non-Binding Tow Bar # e74ZR. This tow bar comes with safety cables included and has an adjustable head and hank to help keep the tow bar level between the motorhome and Fusion. Tow Bar Wiring Kit: Roadmaster Diode 7-Wire to 6-Wire Flexo-Coil Wiring Kit # RM-15267. This kit will come with everything you need to display...
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  • Recommended Flat Towing Set Up for a 2016 Ford F-150 w/ Blue Ox Tow Bar
    Yes, there is a base plate that fits your 2016 Ford F-150 that will work with your Blue Ox Aventa Tow Bar. It is the Demco Tabless Base Plate Kit item # DM56MV. You will also need the Adapter for Blue Ox Tow Bars to Demco Classic Base Plates item # DM9523034. You are correct there are no Blue Ox base plate kits or kits that will work with your Aventa tow bar and fit your F-150 without an adapter. I highly recommend the Blue Ox Patriot 3 Radio Frequency, Portable Braking System item #...
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  • Best Flt Tow Wiring Kit for a 2023 Ford F-150 Hybrid with LED Lights
    Since your 2023 Ford F-150 has the LED lights I highly recommend the Roadmaster Smart Diode 7-Wire to 6-Wire Wiring Kit # RM38FR which has better diodes to make it compatible with the LED lights. The Demco Kit # DM9523010-54 has some really basic diodes which is why I recommend the Roadmaster over this. Demco doesn't list out fitment with LED lights but Roadmaster has a few diode kits and they say this newer one needs to be used for your truck. You'll also need the Charge Line Kit # RM-156-25...
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  • How to Find Tail Light Functions on 2023 Chevy Equinox Premier for Flat Tow Light Wiring
    Thanks for reaching out! The correct wiring harness for flat towing your 2023 Chevy Equinox Premier will be the Smart Diode kit from Roadmaster. You need part # RM26FR if you have incandescent tail lights or part # RM38FR if you have LED tail lights. To determine the correct wires to splice into you need to remove the clip from the tail light and then use a circuit tester like part # PTW2992 to check what functions are on each pin. Unfortunately we don't have a pin-out of what functions...
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    Image 1 for Image 2 for
  • Recommended Flat Towing Set Up for a 2019 Chevy Equinox
    I am guessing by tow device you mean tow bar. If you are wanting to use a Roadmaster tow bar you will want to use a set of Roadmaster base plates so you don't have to mess with purchasing an adapter. The two companies don't like to work together and Roadmaster is the better option. The Blue Ox base plate that fits your 2019 Chevy Equinox is the item # BX1730. You will need the Roadmaster Tow Bar to Blue Ox Brackets Adapter item # RM-031 to work with a Roadmaster Tow bar. To flat tow...
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  • How To Install Diode Tail Light Wiring In A 2020 Chevy Equinox
    A 2020 Chevy Equinox can't use a standard diode kit like the # RM-154 and would instead need smart diodes like the # RM26FR (incandescent) or # RM38FR (LED). These vehicles have variable voltage wiring so using a standard diode wouldn't allow the lights to properly display the signals form your 2019 Jayco Alante 26X. For the installation you'll just need to determine if the motorhome has separate or combined tail light wiring to determine the correct wiring procedures. In a combined system,...
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  • Is Brake Light Switch Needed w/ Invisibrake Supplemental Braking System on 2021 Chevy TrailBlazer
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  • Flat Towing Components And Requirements For A 2024 Chevy Equinox
    2024 models of the Chevy Equinox have the same steps listed as the 2023 models to get the vehicle ready to flat tow: 1. Position the vehicle to be towed and secure it to the towing vehicle. 2. Start the vehicle. 3. If equipped with AWD, engage the AWD system and confirm that it is on. 4. Move the shift lever to N (Neutral). 5. Then, put the vehicle into accessory mode by pressing ENGINE START/STOP one time without the brake pedal applied. An amber light will appear in the button when in...
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  • Components And Steps Needed To Flat Tow A 2023 Chevy Equinox LS FWD
    Yes, the manual for a 2023 Chevy Equinox lists the same instructions for both the AWD and FWD models. I've copied the instructions and my component recommendations below for you: 1. Position the vehicle to be towed and secure it to the towing vehicle. 2. Start the vehicle. 3. If equipped with AWD, engage the AWD system and confirm that it is on. 4. Move the shift lever to N (Neutral). 5. Then, put the vehicle into accessory mode by pressing ENGINE START/STOP one time without the brake...
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  • Recommended Flat Towing Parts for a 2023 Ford Bronco
    I would be happy to and congrats on the new purchase. To flat tow your 2023 Ford Bronco Wild Trak you will need the following parts: Tow Bar and Safety Chains - Blue Ox Alpha 2 Non-Binding Tow Bar item # BX7380. This tow bar features non-binding latches and a swivel function that makes connecting/disconnecting on any terrain easy. Base Plate Kit - Blue Ox Base Plate Kit item # BLU23XR is designed to fit all models of the 2023 Ford Bronco with the Ford Performance heavy duty modular bumper...
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  • Recommended Flat Towing Parts for a 2023 Ford Bronco with a Standard Bumper
    To flat tow your 2023 Ford Bronco with a standard bumper you will need the following parts: Tow Bar and Safety Chains - etrailer SD Non-Binding Tow Bar for Direct-Connect Base Plates item # e74ZR Base Plate Kit - Roadmaster Direct-Connect Base Plate Kit - Removable Arms item # RM79RR Wiring Harness - Roadmaster Diode 7-Wire to 6-Wire Flexo-Coil Wiring Kit item # RM-15267 for incandescent bulbs or item # RM38FR if you have LEDs. Charge Line Kit - Roadmaster Battery Charge Line Kit item...
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    The Roadmaster Sterling Tow Bar item # RM-576 is compatible with both direct connect and crossbar style base plates so depending on which model you have you may need to remove the crossbar. The base plates for the 2022 Ford Bronco install where the D-rings are mounted. They have to be removed as they are not rated to be flat towed with. To flat tow your 2022 Ford Bronco you will need the following parts: Safety Chains - Roadmaster item # RM-643 Base Plate Kit - Roadmaster Direct-Connect...
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  • Recommended Tow Bar Wiring Kit For Flat Towing A 2022 Ford Bronco
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  • All Parts Needed to Flat Tow 2021 Ford F-150 Hybrid
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  • What Flat Tow Wiring Harness Do I Need for a 2023 Ford Bronco Outer Banks w/ LED Lights?
    To control your 2023 Ford Bronco Outerbanks LED lights you will need the Roadmaster Smart Diode 7-Wire to 6-Wire Wiring Kit for Variable Voltage LED Tail Lights item # RM38FR. This wiring kit lets you connect your RV's tail, brake, and turn signal lights to your Bronco's lighting system. The smart diodes make sure that your variable voltage, LED tail lights function correctly while your Bronco's being towed. Here are some other parts you will need to flat tow your 2023 Ford Bronco Outer...
    view full answer...
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Info for this part was:

Employee Lindsey S
Written by:
Lindsey S
Employee Jameson C
Expert Research:
Jameson C
Employee Joshua S
Video by:
Joshua S
Employee Chris R
Video by:
Chris R
Employee Jacob T
Video Edited:
Jacob T
Employee Dustin K
Video Edited:
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Employee John S
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Employee Mike S
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Employee Ryan G
Test Fit:
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