To see if this custom-fit item will work for you please tell us what vehicle you'll use it with.
Thank you! Your comment has been submitted successfully. You should be able to view your question/comment here within a few days.
Error submitting comment. Please try again momentarily.
Diode kit allows you to use your vehicle's tail lights and wiring system while preventing feedback from your RV. Wires 2-wire and 3-wire systems to operate as a combined lighting systems. Connectors and Extension loop sold separately.
Features:
Specs:
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.
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.
California residents: click here
Bought as part of the installation of the Invisi-brake system and installed as part of the lighting system. Does the job for which it is designed. All lights work as they should.
have successfully completed the installation of the following items that I purchased from etrailer:
> Nighthawk RM-676 tow bar
> RM-524458-5 base plate
> DEMCO Stay in play DM86VR
> RM-152 diode wiring kit
> RM-156-25 charge wire kit
> RM-88400 brake switch relay kit
I work slow but methodically. I had no issues other than the high degree of difficulty for a 68 y/o man working alone. This project exceeds the abilities of someone NOT mechanically inclined. There is also the need for some specialty tools. I found that feeding the wiring through the dash, firewall, and underbody was more difficult than installing the front baseplate. Overall, I am satisfied with the function of this installation. I am glad I did it myself rather than having it done.
Tow vehicle: 2021 Entegra Emblem 36U
Towed vehicle: 2018 Ford Fusion Platinum Energi
Installation was easy with the directions and the video.
Just finished installing the “kit”, everything went well, the video on the etrailer web site helped but was slightly different than my installation since it was a 2006 model and mine is a 2012.
Should make towing and hooking/unhooking easier and safer than using the magnetic lights.
I’m using the Pollack 6 pin connector with the wiring “kit”.
Steve C.
3/4/2020
Works Great, Totally Transparent During Towing or Normal Use
Product came on time. Installed per ins tructions
E Trailer staff goes above and beyond with Customer Service and Quality Equipment!!
Installed easily and have had no issues with it.
Great product and easy to follow instructions and video for installation.
This kit is pretty straight forward. Installed and works well like the installation says it should.
Excellent service, knowledgeable and patient. Quick delivery, All excellent!
William
9/10/2024
Perfectly
It fits the bill--when they say universal that's correct; may not be a "factory" wiring harness but our Super Beetle is 45 yrs old.
Great customer service.
sold me the wrong kit
Great product
I think that the diodes need pig tails that could be soldered and sealed with shrink tube.
I don’t want to think about the salt, mud and water eating away at the exposed connections.
SAME AS THE FIRST ONE
Very well made and makes a tight connection on each end.
Make running tail light power from your tow vehicle to your flat tow vehicle easy.
Negative battery disconnect system started not working after less than a year
Had to go to local Chevy Dealer to have the battery disconnect system disconnected as was causing whole electrical system to shut down at inadvertent times
Jenny N.
9/25/2023
The wiring kit does have a limited lifetime warranty and I wanted to ask if you have reached out to Roadmaster?
I'm not sure if the manufacturer or etrailer should have required that a 12 volt connection from the motor home to the tow vehicle? Our first trip From Nampa Idaho to Mesa Arizona. On the second day of travel, the batteries were stone dead and it took AAA to jump the batteries with double jumpers to finally start the Jeep. This caused the Jeep to set several trouble codes. Once again on the 3RD day the batteries were dead, but we were able to start the car with a battery jumper. The next day we took the Jeep to the Dealership and they cleared all trouble codes and replaced the batteries and we had no further problems on our return to Idaho. On returning home I added a connection (with a inline fuse) from the motor home to the Jeep. In conclusion I am NOT sure if the batteries were defective, but adding the 12 volt connection, no towing problems whatsoever.
Best Regards Gregg
Gwendolyn Y.
2/16/2025
Hey Gregg. I'm sorry to hear that that happened on your trip. I did some digging and it looks like your Jeep would need a charge line kit part # RM-156-25.
etrailer always has what you need with competitive prices.
This review is for E-Trailer. I ordered a complete dinghy towing set-up for the dinghy as a towbar came with the RV we purchased. I called E-Trailer and spoke with a very knowledgeable young lady and when I told her what I needed in layman’s terms she came up with what I would need to complete the dinghy preparation in order to safely tow it behind our RV. Everything they said it would do went just as the instructions directed. I ordered a Roadmaster Falcon 2 set up for the dinghy and they suggested a Blue Ox self contained braking system for the SUV itself. hey also suggested the complete wiring system and plug for the dinghy. To my amazement after the RV and dinghy were connected that also was as easy as they said it would be. Our first tow with the dinghy was great and the unhooking was also a very easy experience. This company was awesome to work with. Thank you for your knowledge and great products.
Works great
Everything works for the braking system. Very easy to hookup.
Installed a Blue Ox Base Plate kit on a 2015 Cadillac SRX. The base plate arrived promptly and was well packaged considering its weight. Watched the videos etrailer provides and used them as a step by step video guide. The videos were a big help. Installation is not too difficult if you're mechanically inclined. Had someone help with the installation but one person can perform the installation. I think the base plate is well engineered and everything fit as it should. Love the fact the installation is so well hidden. We have about 400 miles on the installation and have had no issues. Thanks to etrailer for a great price, great service, and great product support.
Do you have a question about this Flat Tow Wiring Harnes?
Info for this part was:
At etrailer.com we provide the best information available about the products we sell. We take the quality of our information seriously so that you can get the right part the first time. Let us know if anything is missing or if you have any questions.
Jeffrey
11/19/2022
I have no regrets with this purchase. Items preform as advertised with no issues. I am very satisfied with Roadmaster and Demco products.