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Wiring a trailer doesn’t have to mean chasing down wires or tapping into factory circuits. The Curt T-Connector Vehicle Wiring Harness with 4-Pole Flat Trailer Connector plugs inline with your vehicle’s taillight connectors, so there’s no splicing or guessing which wire does what. It’s a simple plug-and-play setup that keeps the factory wiring intact while giving you the connection you need for trailer lights.
This harness includes a powered converter that draws power directly from the vehicle battery through a 12-gauge wire and inline fuse. That setup isolates the trailer’s lighting load from the sensitive vehicle electronics, protecting them from shorts or overloads. It delivers reliable current to your trailer’s running, turn, and brake lights with consistent brightness every time you hook up.
Once installed, only the 4-flat connector is visible at the hitch area, ready to plug into any standard trailer plug. The hidden wiring runs behind trim panels and existing grommets for a clean finish and solid fit. Pair it with a mounting bracket like part #18144 for a tidy, professional appearance that keeps the connector secure and easy to reach.
You won’t need to add relays or alter existing fuses for this harness to work. It comes with the proper inline fuse holder and is rated for use with the vehicle’s existing 30 AMP fuse when present. Everything is designed to connect directly, giving you a ready-to-use wiring solution that makes powering a small trailer straightforward and dependable.

Customer Satisfaction Score:
96% were satisfied with this product
4% of customers were not satisfied
Ratings & Reviews

Joe
10/20/2021
Ive only used the Curt Etrailer wiring harness a couple of times in the past year. It has worked flawlessly each time. Thanks again etrailer.com!

Hans P.
5/21/2019
Excellent......Thank you again....

Ray
3/18/2023
Lights are still aglow and shining bright!

Robert C.
11/25/2018
My hitch system works great. Tough winters, hot summers - no problems.

Brooke M.
12/12/2023
Well, I mean if you really would like to, we wouldnt stop you from getting part # 22282. Its a hitch cover that says etrailer.com on it. Either way though, thank you for the glowing review!

Thomas
2/18/2021
Product works great as intended Was an easy install.

Laura E.
11/16/2016
Thanks so much for the business and the compliment, Joe! However, we always recommend you check the installation instructions before you install.

Ronald
8/1/2023
No issues. This just makes it easy to install trailer wiring.
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Wendell H.
2/9/2018
Still works perfectly with no problems.