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.
Wiring a trailer can be a headache when you have to cut into factory wires, but this harness skips that. The Curt T-Connector plugs straight into the existing tail light connectors to create a 4-pole flat trailer connection. It’s a hidden, plug-and-lead setup that keeps your wiring clean and factory-looking once installed.
This harness includes a built-in converter and requires running the included black 12V power wire directly to the positive terminal of the vehicle battery through an in-line fuse. That isolates trailer power draw from the vehicle’s sensitive lighting circuits and prevents overloads or damage to factory wiring. It’s a more robust setup designed for reliable trailer lighting every time you hook up.
A solid ground is key for dependable trailer lights. The white wire on this harness comes pre-fitted with a ring terminal so you can mount it directly to the vehicle body using the included screw. It’s straightforward—no guesswork, no extra parts needed.
Once installed, the 4-flat connector gives you everything needed for safe towing—running lights, turn signals, and brake lights. It works with standard trailer wiring right out of the box, so you can plug in and hit the road without additional adapters or modifications.
Customer Satisfaction Score:
97% were satisfied with this product
3% of customers were not satisfied
Ratings & Reviews
Craig
4/10/2024
Absolutely perfect so far! I always check all my lights before I go with the trailer and it’s been great!
Martin S.
4/22/2025
Just fine.
Martin S.
4/22/2025
Just fine.
Matthew
8/9/2026
Working out excellent!! I was even rear ended and the hitch receiver was the only thing that looks normal and great, took the blow like a champ. Trailer lights still work.
Victoria H.
2/15/2025
That great to hear, John! What are you towing?
Sierra K.
7/20/2022
I agree, a video would be helpful. As for the green wire, the manufacturer wants you to route the wire exactly as the instructions say to without deviation so it should be the perfect length per the instructions.
Do you have a question about this Custom Fit Vehicle Wiring?
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.
Mike L.
5/6/2026
If power is entering but not leaving the converter box, the converter box is damaged and will need replacing. This is usually caused by a short circuit in the trailer wiring. Before replacing the harness, you'll want to closely examine all the wiring starting with the trailer connector on the vehicle, all the way back to the taillights. Look for damaged connectors and pinched or damaged wire. If you don't repair the short, you'll continue to blow up the converter box.