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Wiring a trailer doesn’t have to mean cutting into your factory wiring. The Curt T-Connector Vehicle Wiring Harness with 4-Pole Flat Trailer Connector uses plug-in connectors that tie directly into your vehicle’s tail light wiring. The harness fits inline with the factory plugs, so installation is clean and simple—no wire tracing, no splicing.
This harness includes an integrated powered converter that draws power directly from the vehicle battery instead of the tail light circuit. That protects sensitive electronics and ensures steady trailer lighting performance. The powered converter is rated for 3 amps each on the right and left turn/brake circuits and 6 amps on the running light circuit, giving you reliable power for your trailer lights.
Once installed, the 4-flat connector gives you all the basics—running lights, turn signals, and brake lights—for safe towing of small to mid-size trailers. It’s the standard connection used on most utility, boat, and cargo trailers, so you can plug in and go without any adapters or rewiring.
Designed as a hidden plug-in system, the harness routes neatly along existing panels and uses a vehicle-end connector that stays out of sight until you need it. The result is a tidy setup that keeps wiring protected from road debris and moisture while maintaining a factory look when not towing.

Customer Satisfaction Score:
90% were satisfied with this product
10% of customers were not satisfied
Ratings & Reviews

Mark
1/19/2022
Still 100... great product!

Terry
7/14/2025
A year later and we have been very happy with this choice. No problems at all.




Donald
8/20/2026
Never did work as I was told twice it would.
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Han
2/12/2023
Update. Product did not work out well. In fact this product was faulty and I purchased an other one which worked correctly. I was asked to send faulty product back at my cost. Unacceptable. So I simply took it apart and recycled the electronics.