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  1. Flat Tow Wiring Harness
  2. Roadmaster
  3. Diode Kit
  4. Bypasses Vehicle Wiring
  5. Tail Light Mount
  6. Universal
Roadmaster Wiring Kit with Smart Diodes for Variable Voltage LED Tail Lights
Roadmaster

Roadmaster Wiring Kit with Smart Diodes for Variable Voltage LED Tail Lights

Part Number: RM47ZR
In Stock
$152.32
Flat Tow Wiring Harness

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The diodes in this kit convert the 12V signal from your RV to a 9V signal, ensuring that your car's variable voltage tail lights function as intended. 4-Wire harness included for installation. Adapter cord and plug sold separately. 1-800-940-8924 to order Roadmaster flat tow wiring harness part number RM47ZR or order online at etrailer.com. Free expert support on all Roadmaster products. Great prices and Fastest Shipping for Roadmaster Wiring Kit with Smart Diodes for Variable Voltage LED Tail Lights. Flat Tow Wiring Harness reviews from real customers.
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  • Reviews (58)
  • Q & A (0)
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Roadmaster Flat Tow Wiring Harness - RM47ZR

  • Diode Kit
  • Bypasses Vehicle Wiring
  • Tail Light Mount
  • Roadmaster
  • Universal
  • 27 Foot Long Harness

The diodes in this kit convert the 12V signal from your RV to a 9V signal, ensuring that your car's variable voltage tail lights function as intended. 4-Wire harness included for installation. Adapter cord and plug sold separately.


Features:

  • 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
  • Power 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, and zip ties
  • Brake light relay (RM-88400 sold separately) may be required if used with supplemental braking system
  • Made in the USA


Specs:

  • Maximum amperage: 5 amps
  • Maximum voltage: 16 volts
  • Wiring harness length: 27'
  • Limited lifetime warranty


This 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 the 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 look and function as intended.


This wiring kit 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 (RO94FR - sold separately) instead.


When installing this kit, you will need to add either a 4-way or 6-way round electrical connector to the front of your vehicle so you can connect to your RV when you're ready to tow. Use one of Roadmaster's coiled cable kits (RM-164-7 or RM-146-7 - sold separately) to get both the connector and the adapter cord needed for fast, easy hookup.


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


152789 Roadmaster Wiring Kit with Smart Diodes for Variable Volt and LED Bulbs

Installation Details RM47ZR Installation instructionsAlternate Instructions RM47ZR Installation instructions

This Product Fits The Following Vehicles




Customer Satisfaction Score:


Customer Reviews

Roadmaster Wiring Kit with Smart Diodes for Variable Voltage LED Tail Lights - RM47ZR

Average Customer Rating:  4.9 out of 5 stars   (58 Customer Reviews)

The diodes in this kit convert the 12V signal from your RV to a 9V signal, ensuring that your car's variable voltage tail lights function as intended. 4-Wire harness included for installation. Adapter cord and plug sold separately.

by:

A complicated setup for the newer 4-wire tail light systems made easy with the online video featuring the make/model that I was wiring. Thank you.



by:

The wiring kit had excellent directions & video which made the install a breeze. It would be even better if it lighted more of the tail lights and brake lights. Most likely it is because of my vehicle design. We did a 7700 mile trip with no issues and worked as expected. I would recommend this item.



by:

I ordered this back in June but had not opened the package until today when a friend was here to assist me with installing it. Unfortunately, it was missing the Insta-dapt Adapter and the hose clamps. I am sure I can use regular hose clamps but definitely need Instadapt Adapter. Would you please send that to me

Etrailer Expert

Jenny N.

9/20/2023

I definitely will have our Customer Service team reach out to you.



by:
Dodge Journey

Braking system worked great on my Jeep. We towed the vehicle on a 6000 mile journey this year. We were up and more importantly, down the Rocky Mountains and the braking system never failed us. Would definitely recommend.



by:

Easy ordering and fast shipping
Had
everything I needed



by:

No hassle with installation. Just follow the instructions and all will work out.



by:

Works perfectly. Great product and sup port



by:

Nice kit you have great videos on installing. Works great. Road master has great products and ETrailer has great prices and service.



by:
2021 Jeep Cherokee

Good kit and etrailer installation video was fantastic. Install went well and was happy to have a helper when dealing with removal/reassembly of body parts.
On complaint that is directed at Roadmaster. They need to use some more appropriate self-tapping screws for taillight area. Metal is thin and self-tapping screws included are large and course threaded. The provided screws would not tighten up properly. I ended up needing to substitute some screws from my parts bin to get a good connection.



by:
2022 Jeep Cherokee

High quality. Received fast.



by:
2023 Jeep Wrangler Unlimited

I have been working with etrailer for years and have always been pleased with their website and service.



by:
2021 Forest River Forester Motorhome

Great service, and very helpful in deciding what was needed.



by:
2022 Jeep Wrangler

Jim B.

9/4/2023

No problems after one year. Would recommend for Jeep owners with factory LEDs.



by:

Haven’t installed yet but purchase and delivery were great



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2022 Jeep Cherokee

Ty



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2023 Jeep Gladiator



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2022 Jeep Wrangler 4xe



by: 05/27/2023
2022 Jeep Wrangler Unlimited


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Show More Reviews

See what our Experts say about this Roadmaster Flat Tow Wiring Harness

  • Does Standard Diode Wiring Kit Fit 2021 Jeep Wrangler For Flat Towing
    Good question, and I checked with Roadmaster for you, and correct tow bar wiring diode kit will depend on if your 2021 Jeep Wrangler has the ParkSense proximity sensors or not. If it does have the ParkSense you will need the kit with smart diodes that ensures your tail lights get the proper voltage. The reason for that is Jeeps with ParkSense have variable voltage tail lights, which means two different voltages depending on if the signal is for braking or turning. So here is what you will...
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  • Base Plate Options For 2023 Jeep Gladiator Mojave For Flat Towing Behind Motorhome
    There are a couple options for base plates on your 2023 Jeep Gladiator Mojave, which are the Roadmaster you mentioned, as well as Blue Ox. Here are the part numbers for both: - Roadmaster Direct-Connect Base Plate Kit # RM77VR - Blue Ox Base Plate Kit # BLU53FR To be frank, the difference between these two base plates is essentially nil. For most people it comes down to what tow bar they have, but since you don't have a tow bar yet, go with the Roadmaster. Reason for that is their tow...
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  • List of Everything Needed to Flat Tow 2023 Jeep Wrangler
    Hi Tony, thanks for writing in and yes, we can 100% get your 2023 Jeep Wrangler set up to be flat towed behind your Holiday Rambler motorhome. To make it easy to order I'll go ahead and list everything out for you. - Base Plate Kit: Roadmaster Direct-Connect Base Plate Kit # RM-521453-5 - Tow Bar: Roadmaster Nighthawk All Terrain, Non-Binding Tow Bar # RM-676 - Wiring Kit: Roadmaster Universal Hy-Power Diode Wiring Kit # RM-152 OR Wiring Kit with Smart Diodes # RM47ZR (See below explanation...
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  • Does Standard Diode Wiring Kit Fit 2023 Jeep Wrangler For Flat Towing
    The correct tow bar wiring diode kit will depend on if your 2023 Jeep Wrangler has the ParkSense proximity sensors or not. If your vehicle does have the ParkSense you will need the kit that has smart diodes so it will ensure that your tail lights get the proper voltage. The reason for that is Jeeps with ParkSense have variable voltage tail lights, which means two different voltages depending on if the signal is for braking or turning. If you do have the ParkSense you will need the Roadmaster...
    view full answer...
  • Tow Bar Wiring Kit Needed For Flat Towing A 2023 Jeep Grand Cherokee Summit
    The brake light switch wire for your 2023 Jeep Grand Cherokee Summit isn't useable so you wouldn't be able to install a brake light relay kit any way. In cases like this the turn signal will override the brake signal until the computer inside the Jeep "goes to sleep" after about 20 minutes. The general guideline is to just get all hooked up and running and let it idle for 20 minutes but gas isn't cheap so most people just take off and let it go to sleep while already towing. Since you...
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  • Wil The Blue Ox Tow Bar Wiring Kit Work With A 2022 Jeep Wrangler JL Unlimited
    Yes, the Blue Ox Tow Bar Wiring Kit # BLU79FR is a compatible wiring harness for your 2022 Jeep Wrangler JL Unlimited. That being said, plug-in style connectors typically have quite a bit of issues and end up failing a lot more than a splice-in diode. Not only that but this harness only gives you a 4-pole connector so you wouldn't be able to add in a charge line to keep your Jeep's battery charged while you tow. I highly recommend switching over to the Roadmaster Diode 7-Wire to 6-Wire...
    view full answer...
  • Comparing Smart Diode Wiring Kits RM47ZR And RM63MR
    The Roadmaster Smart Diode Kits # RM47ZR and # RM63MR are quite similar in that they both contain the same smart diodes, and wiring components. The difference is that the # RM63MR also comes with a 6-pin round plug for the front of the vehicle, as well as a coiled cable to connect the towed vehicle to the Rv 7-way plug. So unless you already have a 7 to 6 coiled cable and a 6-pin socket laying around, we recommend getting the # RM63MR, as it will come with everything you will need to wire...
    view full answer...
  • Does the Roadmaster Universal Hy-Power Diode Wiring Kit Fit a 2023 Jeep Wrangler
    Yes, the Roadmaster Universal Hy-Power Diode Wiring Kit # RM-154 does work for your 2023 Jeep Wrangler as long as you do not have park sense. This will allow you to use your Jeep Wrangler's tail lights and wiring system while preventing feedback from your RV. If you do have park sense, you will want to use the Roadmaster Wiring Kit with Smart Diodes # RM47ZR.
    view full answer...
  • Recommended Blue Ox Flat Towing Parts for a 2023 Jeep Wrangler JL
    To flat tow your 2023 Jeep Wrangler JL with a Blue Ox tow bar, base plates, and supplemental braking you will need the following parts: Tow Bar and Safety Chains - Blue Ox Ascent Non-Binding Tow Bar item # BX4370 Base Plate Kit - Blue Ox Base Plate Kit item # BX1139 Supplemental Braking System - Blue Ox Patriot Radio Frequency item # BLU37TR I checked our system and with Blue Ox's and they do not have any wiring for the 2023 Jeep Wrangler's so unless your motorhome uses a 4-way connector,...
    view full answer...
  • Recommended Blue Ox Flat Towing Equipment For A 2022 Jeep Wrangler Unlimited
    To flat tow your 2022 Jeep Wrangler Unlimited you'll need a tow bar, base plate, tow bar wiring kit, braking system, and safety cables. Since you already have a Brake Buddy for your braking system I have the following recommendations: Tow Bar: Blue Ox Ascent Non-Binding Tow Bar # BX4370. This tow bar features non-binding latches and a swivel function that makes it easy to connect or disconnect from your base plates, even on unlevel ground. Base Plate: Blue Ox Base Plate Kit # BX1139....
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  • Recommended Flat Towing Parts for a 2023 Jeep Grand Cherokee Using a Ready Brute Tow Bar
    To flat tow your 2023 Jeep Grand Cherokee Overland with a Ready Brute Tow Bar, you will need to use the Adapter Brackets for Ready Brute Elite Tow Bars item # BX88297 and one of the following base plates depending on whether or not your Jeep has the tow hooks. Without Tow Hooks - Blue Ox Base Plate Kit item # BLU98CR With Tow Hooks - Blue Ox Base Plate Kit item # BLU68CR Some other parts you will need to flat tow your Jeep are listed below: Wiring Harness - Roadmaster Diode 7-Wire...
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  • How Can I Add A Charge Line To My 2023 Jeep Cherokee Trailhawk?
    It sounds like you have done your homework. You are correct that the smart diode kit # RM47ZR will be needed for your 2023 Trailhawk. This kit does not include a charge line. The good news is we carry a wiring kit specifically for this purpose # RM-156-25. If you already have your 6 pin socket, this kit is all you will need to run a charge from the coach. I have linked an install video below if you want to take a look.
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  • Recommended Flat Towing Equipment For A 2022 Jeep Wrangler Sahara
    There currently isn't a compatible Blue Ox base plate for your 2022 Jeep Wrangler Sahara. There is however the Roadmaster Direct-Connect Base Plate Kit # RM-521453-5 which is a compatible fit (standard factory bumpers). These base plates have a direct-connect connection point for quick and easy hookup as well as removable arms to preserve the factory look of your Jeep when not in use. For the tow bar I recommend the etrailer SD Non-Binding Tow Bar for Roadmaster Direct-Connect Base Plates...
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  • Base Plates For Flat Towing 2022 Jeep Gladiator Mojave With Roadmaster Nighthawk Tow Bar
    We can get your 2022 Jeep Gladiator Mojave set up for flat towing, and I did verify with Roadmaster the exact base plates that fit the Mojave model, and will work with the Nighthawk tow bar. I'll also go ahead and list out the rest of the parts for the complete flat tow set up in case you need them. - Base Plate Kit: Roadmaster Direct-Connect Base Plate Kit # RM77VR - Tow Bar: Roadmaster Nighthawk All Terrain, Non-Binding Tow Bar # RM-676 - Wiring Kit (For Jeep WITH ParkSense Proximity...
    view full answer...
  • Do I Need A Smart Diode Kit To Flat Tow My 2021 Jeep Gladiator
    I can help you out. If you have parksense proximity sensors you will need the smart diode kit. If you do not have this you can use the part that you have # RM-15267. Roadmaster Wiring Kit with Smart Diodes for Variable Voltage LED Tail Lights # RM47ZR. If you are having installation issues regarding wiring I highly recommend going to an RV dealer and having them take a look at it.
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  • Which Diode Tow Bar Lighting Kit for 2022 Jeep Cherokee Trailhawk
    You do not need to remove a trailer brake controller from a vehicle like your motorhome when flat towing a vehicle. The brake output circuit of the brake controller won't affect anything so it can be left as-is. The braking systems for towed vehicles do not go through the traditional trailer wiring like for example the Demco SBS DUO part # SM99251 which uses the brake light signal of the towed vehicle to engage it and then it's own inertia sensor to determine how hard it applies brake pedal...
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  • Does Flat Tow Wiring Kit For 2022 Jeep Cherokee Trailhawk Include Power to Battery
    The wiring kit to flat tow your 2022 Jeep Cherokee Trailhawk does not include a charge line to the battery, so you would need to get one separately and install that so the battery does not die. If your motorhome does not have a charge line you would also need that (though most do so long as your motorhome has a 7-way). Since your '22 Cherokee Trailhawk has LED lights and the ParkSense feature, there is a specific wiring harness you'll need, and I'll go ahead and list out all the parts...
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  • Diode Kit Needed For A 2021 Jeep Wrangler With ParkSense Proximity Sensors
    That is correct, if you have ParkSense proximity sensors then you'll need to install smart diodes # RM47ZR and would still need a 6-pole socket and adapter cable # RM-146-7 to connect your 2021 Jeep Wrangler Rubicon 4XE to the motorhome. The # RM-15267 I recommended before would be the correct choice if you didn't have those sensors. I've attached some videos below to help you with the installation process as well.
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  • Recommended Flat Towing Setup For A 2023 Jeep Wrangler 4XE
    For a 2023 Jeep Wrangler 4XE you'll need the following components: Baseplate: Roadmaster Direct-Connect Base Plate Kit # RM-521453-5. These custom-fit baseplates are designed to work with factory bumpers, if you have an aftermarket bumper please let me know and I can start looking for the correct fit. Tow Bar: etrailer SD Non-Binding Tow Bar # e74ZR. This tow bar is designed to fit the baseplates I recommended above and comes with safety cables included so you won't have to purchase...
    view full answer...
  • Recommended Flat Towing Set Up for a 2022 Jeep Wrangler Sport
    I would be happy to give you a list of parts you will need to flat tow your 2022 Jeep Wrangler Sport behind your motorhome. In addition to a tow bar and base plate kit, you will need a wiring harness and potentially a proximity sensor with diodes, a supplemental braking system, stop light switch, and a high low adapter. Tow Bar: etrailer SD Non-Binding Tow Bar for Roadmaster Direct-Connect Base Plates item # e74ZR. This tow bar has a 6,000 lbs capacity and includes the required safety...
    view full answer...
  • Recommended Parts to Flat Tow 2022 Jeep Wrangler JL
    We have everything you need to safely flat tow your 2022 Jeep Wrangler with your 2022 Thor Venetian Motorhome. There 5 basic components needed, base plates, tow bar and safety cables, tow bar wiring for indicator lights and a supplemental braking system. - Base Plates, Roadmaster Direct-Connect Base Plate Kit # RM-521453-5 - Tow Bar, Roadmaster Nighthawk, # RM-676 (this option includes needed safety cables) - Wiring Kit , for a Jeep Wrangler WITHOUT ParkSense Proximity Sensors, Roadmaster...
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  • Recommended Flat Towing Set Up for a 2023 Jeep Wrangler w/ LOD Bumper
    Congrats on the new Jeep! It looks like the LOD signature bumper comes with the Blue Ox Off-Road Bumper Adapters item # BX88358 that fit the 1" D-rings so you will want to get a Blue Ox tow bar. I have linked a picture of the adapter below so you can confirm you have one. If not this is the one you will need to purchase, item # BX88358. For a compatible tow bar I recommend the Blue Ox Ascent Non-Binding Tow Bar item # BX4370. This tow bar features non-binding latches and a swivel function...
    view full answer...
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  • Recommended Flat Towing Parts for a 2024 Jeep Wrangler Unlimited
    To flat tow your 2024 Jeep Wrangler Unlimited you will need the following parts: Tow Bar and Safety Chains - Roadmaster Falcon 2 Tow Bar item # RM-520 and item # RM-643 Base Plate Kit - Roadmaster Direct-Connect Base Plate Kit - Removable Arms item # RM-521453-5 Wiring Harness - Roadmaster Diode 7-Wire to 6-Wire Flexo-Coil Wiring Kit item # RM-15267. This diode kit allows you to use your Jeep's tail lights and wiring system while preventing feedback from your RV. This kit will come with...
    view full answer...
  • Flat Tow Set-Up for 2022 Jeep Gladiator Mojave
    You need five basic components to safely flat tow any vehicle, base plates, tow bar, safety cables, indicator lights wiring solution and supplemental braking. For your 2022 Jeep Gladiator Mojave, I recommend: - Base Plate, Roadmaster Direct-Connect Base Plate Kit, # RM77VR. - Tow Bar, The Non-Binding Roadmaster Nighthawk All Terrain Tow Bar, # RM-676 that includes the needed safety cables. - Wiring for Indicator Lights, Select the Roadmaster Wiring Kit with Smart Diodes, # RM47ZR if...
    view full answer...


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