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Roadmaster Smart Diodes for Variable Voltage LED Tail Lights - Qty 2
(391 reviews)
Price: $95.67
In Stock
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Roadmaster Smart Diodes for Variable Voltage LED Tail Lights - Qty 2
Part Number: RO54FR
In Stock
$95.67
Confirmed to Fit
2022 Jeep Cherokee
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- All Info
- Reviews (391)
- Q & A (0)
- Photos
Roadmaster Flat Tow Wiring Harness - RO54FR
- Diode Kit
- Splices into Vehicle Wiring
- Roadmaster
- Universal Fit
These smart diodes ensure your RV's brake and turn signals display correctly on your car's multiplex LED tail lights. Prevents damage from electrical feedback. Includes 2 diodes.
Features:
- Smart diodes correctly display RV's brake and turn signals on your towed car with variable voltage LED tail lights
- Converts the 12V signal from your RV to a 9V signal so your tail lights work as intended
- Prevents feedback that can damage your vehicle's eletrical components
- Keeps the battery from draining while flat towing
- Resists corrosion with powder coated aluminum casing
- Quantity: 2 diodes
- Made in the USA
- Limited lifetime warranty
Note: If you need a complete kit with wiring and installation supplies included, pick up RO44FR (sold separately) instead.
What are Variable Voltage Tail Lights?
A variable voltage tail light (also known as multiplex) uses the same wire for both the brake light and the tail light, sending a 12-volt signal to the brake light and a 9-volt signal to the tail light. This works fine when you're driving, but when you are flat towing, the RV will send a 12-volt signal to both the brake light and tail light, making them the same level of brightness and impossible to distinguish from each other. The drivers behind you won't be able to tell the difference between your tail lights and your brake lights, which is a huge safety issue.
These smart diodes solve that problem by simply converting the signal from the RV to the lower voltage needed for your car's tail lights. They install permanently, but don't worry; everything will work as normal when you're not flat towing.
What if I Have Incandescent Tail Lights?
This kit is designed to work with LED lights only, so if you have incandescent variable voltage lights, you'll need kit RO34FR (sold separately) instead.
Wiring Diagram for Roadmaster Smart Diode Kit
789 Road Master Smart Diodes for Variable Voltage LED Tail Lights - Qty 2
Installation Details
Customer Satisfaction Score:
92% were satisfied with this product
8% of customers were not satisfied
- etrailer mistake
- Product did not meet expectations
- Wrong item was ordered
Ratings & Reviews
4.6
391 reviews
by:
Robert K
03/18/2026
I purchased a complete flat tow package from etrailer. When I installed everything I found out that my lights were both incandescent and led so I called etrailer and Jeremy sold me the Smart Diodes for variable Voltage LED Tail Lights. This was the perfect solution to my problem. Just towed over 800 miles without any issues.
Thank you to etrailer for getting me on the right path.
Thank you to etrailer for getting me on the right path.
by:
Mervin
09/08/2026
This smart diode worked like it was meant to.
by:
Joe
01/23/2025
This review isn't about the product which works great, it's about the employees. I ordered the part and was to be delivered the next day. That didn't happen. Finally got that part(which was the wrong part, my fault not theirs), on Wednesday due to a screw up with UPS. Called on Saturday and talked with Adam who sent the correct part out same day!! Got it today and will install tonight. Still would like to see a credit on my overnight shipping from last week, but that's another issue.
by:
Larry
09/02/2026
They worked on my 2025 Jeep as advertised.
by:
William
11/29/2025
Its an easy install. It took longer to run the wires from the front bumper to the tail lights.
by:
Steve
05/09/2025
Just what i needed to connect my 2020 Sierra 3500 HD up to the motorhome to be towed. My Sierra came with LED taillights, which are not standard for that year.
by:
Bryon
08/14/2025
Very fast shipping of quality products.
by:
Kevin
08/14/2022
There needs to be more clarity on which ones are needled to work with vehicles. I ordered the kit that has more diodes. After opening the kit and called the help line and was told it will work. So I even emailed asking to order the smart diodes if they could discount them because I already opened the package on fist order and I could still use the rest of wiring. No response so I just ordered the right ones. There is no room for more than one diode.
by:
Debra
10/09/2024
Unfortunately replacing the stereo did not fix my left tail light issue. I fear it's a possible wiring issue and unfortunately I live in Arizona and there is no e-trailer down here for me to take it to for repair. I would imagine the new diodes are perfectly fine
by:
Valerie
10/06/2022
The dealer installed the wrong diodes for our tow set-up and our lights never worked properly. Looked on etrailer and found a how-to video that explained the problem, ordered this product (the correct diodes), and now everything works just as it should.
by:
David
06/03/2024
work great and easy to install.
David
6/4/2025
Still working great
by:
Edward
07/26/2021
installed fairly easy ,once i got wiring diagram for 2020 jeep gladiator/with LED lights LED tail lights need smart diodes ,not 4 reg diodes
by:
Z
05/26/2025
It’s very good thanks
by:
Robert
07/02/2023
They work great and are a nice compact size. However, the instructions on the packaging is different than what is shown on the actual device leading to confusion.
by:
Frank
04/06/2025
Excellant kit with easy instruction to follow. Lights worked great, very happy.
by:
Richard
04/03/2025
I haven't used them yet.
by:
Robert
04/29/2025
Robert
4/30/2026
It works! It took a bit of test wiring, to finally get the right wires connected to the right leads on the diodes, but that was due to my inexperience. After a year, the system still works as expected.
by:
Milton
12/08/2024
It wasn't what I really wanted wouldn't use this next time, but already bought. There is better and cheaper on the market.
by:
Georges
02/12/2024
Great service and great job keeping us updated with the transit. We will definitely shop here again! Thank you.
by:
Randy
02/18/2024
The diodes have functioned without fail.
by:
George
01/17/2024
Worked as advertised.
by:
Roland
11/08/2023
I had to develop a method to make them work for my 2015 Ford Edge SEL.
by:
James
07/27/2021
This product works very well but the wire diagram was not correct.
by:
Paul
04/29/2023
Great service, when I called they were very helpful
by:
Nicholas
10/13/2021
Perfect besides packing is all bent up
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view full answer...
Do you have a question about this Flat Tow Wiring Harnes?
Info for this part was:
Edited by:
Lindsey S
Installed by:
Jeff D
Expert Research:
Jameson C
Video by:
Dustin K
Updated by:
Wilson B
Updated by:
Amanda K
Written by:
Mike S
Video Edited:
John S
Video Edited:
Ethan H
Test Fit:
Scott A
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Joe
1/24/2026
It’s still good. If you aren’t close to flat or straight it will bind. Really have to be forceful with it unless the toad is flat and straight behind motorhome. Then it’s a piece of cake.