Curt Custom Tail Light Wiring Kit for Towed Vehicles
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2019 Ford F-150
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2019 Ford F-150
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Plug-and-play custom harness gets turn and brake signals on your towed car with no hardwiring or splicing, and no effect on your warranty. The built-in diodes protect your car from electrical feedback.
Features:
Specs:
Notes:
A combined lighting system, or 2-wire 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, or 3-wire 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 the engine is off and your car's brake lights illuminate when you press the brake pedal, 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
Simple and easy purchase process. The installation of the Curt custom tail light wiring kit was almost as simple and easy as the purchase. etrailer is great!
Easy installation. Affordable and depen dable.
Great purchase as usual! Product worked perfectly and was easy to install. Speed of delivery, communication and support were awesome.
2025 jeep wrangler,
getting feedback from tail light and blinkers to braking system on toad vehicle while towing causing brakes on toad vehicle not to dis-engage when brakes released , had to remove harness and install a different model with better diodes to make system work
That model specific light harness is awesome. Worked great in my Wrangler JLU.
Thanks for the help.
Fit the Gladiator perfectly. Easy to in stall.
In spite of a few negative comments, this harness install on a 2025 Jeep Wrangler Rubicon Unlimited was super easy and straight forward. Fit the application well. Plenty of wire lengths and easy connections. Works well after testing, will see about longevity as time goes.
Gwendolyn Y.
12/11/2025
Thanks for sharing your experience with installing the harness, Dan! Do you have any upcoming travel plans or waiting for spring to come back around for the next trip?
Looks like it will do the job.
Jimmie
7/11/2026
Working fine
This was a complete wiring kit did a great job
Items seems to be high quality. Good in structions.
Like everything else from etrailer, this is super easy to work with and high quality
Easy to install, works great on my 2023 Jeep Gladiator with LED taillights!
I ordered the wrong part to start so got that corrected and the customer service was great new part arrived in just a box no part number so hoped it was the correct part this time looks like it is but would be helpful if it is open to have a part number on the product so I know it is the correct item
Easy to install, especially with the YouTube install video.
It was well made and fit perfectly. Good instructions and they even provide the zip ties to strap it down.
Wiring kit was an easy install and has worked perfectly.
The wiring kit is SHORT!!
It lacks 3’ in making it to the baseplate.
I was concerned when I received it and noticed the box indicated it was for a Jeep JL which is a bit shorter than a gladiator.
The fix is to splice the harness, what a horrible situation!
fit & function was perfect.easy instructions to follow
Robert
6/19/2026
No problem at all
Product was excellent as advertised however installation instructions could be better with clearer pictures. Routing of wiring at rear of vehicle has many options however one route gives the safest and easiest to install.
Curt
2/26/2026
Excellent service out of the cable kit with perfect operation. Highly recommend.
Two issues with the wiring harness. First, didn’t need the additional plug in for a rear light outlet. I feel that just gives it a possibility of a future issue. And Second, my main issue is this wiring harness is listed as compatible for the 2025 Gladiator. The lead wire from the tail light to the front of the vehicle for connecting to the flat tow 6 way plug is about 3 feet too short. It only follows the frame to the point of the wiper reserve. Then you are out of wire. It doesn’t reach the front bumper to connect to the 6 way plug. Very disappointed I had to another section of 4 way wires to complete the job.
Works great, loved not having to cut factory wiring with this plug and play harness.
They said it would fit my Jeep. it does not. All of the connectors are incoreect and cannot be connected to the Jeep Connectors. Now I have to bay for shipping both ways for them to send me the wrong thing.
Exactly the wiring harness I need for flat towing my 2020 Jeep Wrangler
Wire harness was easy to install on my 2024 Jeep Wrangler. The front hitch took some work to line up the bumper bolts but I finally got it.
The only suggestion I would make is build the wiring harness so the cable is routed on the side opposite the exhaust so it would be a little cooler. (Or I put it on backwards) I also added wire loom to all the uncovered wire.
Do you have a question about this Flat Tow Wiring Harnes?
Info for this part was:
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Robbie
5/28/2025
The Curt custom tail light wiring kit is still working great!