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Wiring for trailer lights doesn’t have to mean cutting into your vehicle’s wiring. The Curt T-Connector Vehicle Wiring Harness with 4-Pole Flat Trailer Connector plugs directly into the factory tail light connectors. It’s a true plug-and-play setup that keeps your original wiring intact while giving you a standard 4-flat trailer connection for running, brake, and turn signals.
The built-in powered converter isolates the trailer wiring from the vehicle’s sensitive electronics. It draws power directly from the battery through a dedicated hot lead and protects the system with an inline 10-amp fuse. If a fault occurs in the trailer wiring, it won’t backfeed into your vehicle circuits. That extra protection keeps things safe and prevents costly electrical issues.
This harness includes a power wire that runs to the battery instead of tapping into existing outlets. That direct connection ensures steady current for trailer lights and reduces the chance of blown fuses or dim lighting. It’s designed to work independently of any 12-volt accessory circuits for consistent performance every time you tow.
At the back, the weather-sealed 4-flat connector provides a clean, reliable hookup to your trailer’s male plug. It’s ready to connect right out of the box and built for compatibility with standard trailer wiring setups. Add a dab of dielectric grease to help prevent corrosion, and you’ll have bright, dependable signal lights whenever you hitch up.
Customer Satisfaction Score:
96% were satisfied with this product
4% of customers were not satisfied
Ratings & Reviews
Otto P.
10/22/2024
Still working perfectly. Just towed a trailer over the weekend, everything is tip top.
Heather A.
3/22/2018
Brandon, Thank you for your review. We do not recommend running the power wire to any other source besides the vehicle battery to avoid overloading your vehicles electrical system. Not all vehicles can handle powering trailer lights and has to draw the power from the battery. I have attached a link to help with routing this power wire.
Helpful Links
Jenny N.
5/2/2024
I can say that we d r o p p e d the ball on this one. We will be in touch with you to discuss a resolution.
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Alex S.
7/20/2018
Sold the STI after 3 months of ownership. It was too small and even with a trailer hitch to tow our gear, the gas tank was too small. Sold it and bought a Jeep Grand Cherokee Trailhawk. Couldnt be happier.