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.
This complete kit includes everything you need to carry your RV's brake and turn signals to your towed car's tail lights. Diodes prevent electrical feedback. The hybrid coiled/straight adapter cord is ideal for tow bars with channel guides.
Features:
Specs:
Notes:
"Don't be intimidated by diodes: if you can strip and crimp wire, this installation will be no problem."
A combined lighting system uses the same light bulb to signal both braking and turning. (In other words, the car signals a turn by flashing the brake light.)
A separate lighting system has the brake signal and the turn signal light up independently of each other. Typically the turn signal is amber.
To keep the separate lighting system on your car functioning properly while you're flat towing, add a wiring converter (118158 - sold separately) and 2 additional diodes.
If your towed car's brake lights illuminate when you press the brake pedal with the engine off, you need to install a brake light relay (RM-88400 - sold separately) with this kit. Without a relay, your car's brake signal will override the turn signal sent by the RV when you are slowing down to make a turn, creating a potentially dangerous situation. Other drivers will see that you're slowing down, but not that you're making a turn. With a brake light relay, you can signal both and travel safely.
Customer Satisfaction Score:
96% were satisfied with this product
4% of customers were not satisfied
Ratings & Reviews
Great customer service
Ordering was easy and shipping updates were helpful
Easy installation
worked out fine. But I was sent 3 harnesses and had to remove the one from the tow bar.
The instructions and materials are perfect for my tow vehicle. Looking forward to using them in the future.
Cord no longer works when using the left directional light.
Nice product! Very quick shipping. Than ks.
Worth the time to install,very easy to disconnect and reconnect
Worked well just like video, snaked wire thru divers side frame to behind wheel well and run to front of jeep, was a little time consuming not having a lift.
Great product, with etrailer on line video on [online] the installation was a breeze.
Excellent instructions online. Rapid shipping and delivery.
Does what it is intended to do. Took a little time to install but it came with all the instructions I required, and it all looks and works great!
Very knowledgeable, polite and helpful customer service. Excellent shipping. Very happy customer.
I don’t think my installer got it right. Brake lights override the turn signals. Everything else works great.
Highly recommend E-Trailer for all of your towing accessories. Great product, great customer service!!
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!!
My E-trailer experience was outstanding! From the great selection guide to the delivery to the installation support. The installation videos were very helpful. I had two installation issues that were answered with a prompt phone call. One call was on a Saturday morning. I highly recommend E-trailer!
Wiring kit is a must have. What keeps me from giving it 5 stars is the fact that you need to use butt connectors to connect to truck wiring harness. Best would be to have plug and play connectors or this wiring harness.
Install was straightforward. I installed on a 370z. I have three issues though:1.the wire end connects are not heat shrink (using a heat gun) so I added heat shrink tubing. 2: the wire is too short. I snaked the wire through the interior and it ended up being about 6 inches too short so I had to splice additional wire (which hacks me off), and 3. The wire loom is too short. Not enough to fit between the taillights. No issues with etrailer but seems that Roadmaster could have spared just a bit more expense for a better install.
The wiring harness for signals and brake lights was a four-wire ribbon mold with a white, brown, yellow and green. I installed it on a 2001 GMC Yukon XL. There was barely enough wire remaining at the front bumper area to install into the 6-wire plug. The four wires go to different places and have to be pulled apart which risks exposing copper strands. I would have preferred to have four separate wires to lower risk of peeling the cladding. The worst part is that after installing DEMCO's Delta Force supplemental brake, both of my towed GMC Yukon XL signal lights would blink when I used my RV signals, whether left or right. I've towed it over 13,000 miles now on four trips and haven't been hit or stopped by the St Pol. They veh's behind me see both Yukon lights blink, but they can see the yellow, intended turn signal on my RV as those lights are almost 6 ft high. When I decide to wire my 2020 Silverado, I won't buy a kit from you, just the diodes. I'll buy my own AWG 16 or 14 (? can't remember) wire in the same colors. I'll bundle it and put it my own black flex loom. That's the other thing. Your Roadmaster kit didn't have anywhere near enough loom to protect the wire.
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.
Works well.
The plug in to auto did not work, had to get another. Being that it is enclosed within unit wrapping, I JUST HAD TO TIE IT UP FOR TRAVEL. so ITS functionality, side lights did not work also. Finally it is quite heavy. Overall stay away from this unit.
Brooke M.
5/3/2022
Thank you for reaching out! This item has a limited lifetime warranty and I have sent that information along to you.
Super fast shipping. Great communication. Well packaged. Thank you!
One diode overheated and failed. Had to purchase another diode to replace it. Mounting tape does not stick well, need to use zip ties.
Do you have a question about this Flat Tow Wiring Harnes?
Info for this part was:
At etrailer 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.
Chris
7/15/2026
It works well. I like this system better than others.