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 doesn’t have to mean digging into factory circuits. The Curt T-Connector Vehicle Wiring Harness with 4-Pole Flat Trailer Connector plugs straight into existing tail light connectors for a simple, no-splice setup. You get a clean installation that’s easy to reverse and doesn’t disturb your vehicle wiring.
This harness includes a powered converter box that isolates the trailer wiring from the vehicle lighting system. It keeps the draw from the trailer lights off your factory circuits to prevent overloading or shorting. If the trailer has a wiring fault, it won’t damage your vehicle’s lighting controls.
The 4-pole flat plug delivers running light, brake, and turn signal power to your trailer. It’s the most common connector style for small utility trailers, boat trailers, and cargo haulers, so you can hook up and go without adapters.
A poor ground connection is one of the biggest causes of trailer light problems. This harness uses a dedicated ground wire that must be secured to clean, corrosion-free bare metal, giving you consistent lighting performance under braking, signaling, and running lights.
LED trailer lights draw less current than incandescent bulbs, which keeps the converter from being overworked and ensures full brightness from your trailer lights. The Curt T-Connector’s design supports these low-draw LED setups for efficient, long-lasting performance.

Customer Satisfaction Score:
93% were satisfied with this product
7% of customers were not satisfied
Ratings & Reviews

Nd H.
12/21/2022
Excellent, thanks for saving me money. Love your products. Send 50 off coupons, cause Im so nice.

Jon
7/30/2019
Product is still working great. Had never come loose and still feels as sturdy as when I installed it.
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.













Heather A.
5/22/2021
Thank you for your review. It sounds like you are having a common ground issue. In most cases when some trailer lights work and others dont it is the ground connection on the vehicle side or the trailer side. You want to make sure the wiring harness ground connection is grounded to a clean bare metal surface free of dirt or paint.