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Wiring a trailer can be a headache if you have to cut into your vehicle’s wiring, but this harness avoids all that. The Curt T-Connector Vehicle Wiring Harness with 4-Pole Flat Trailer Connector plugs directly into the tail light connectors for a clean, straightforward install. No cutting, no guesswork—just connect it and you’re set up with a working 4-flat trailer plug.
This harness includes a powered converter that draws power directly from the vehicle battery instead of the factory light circuits. That means even if your trailer wiring shorts out, your vehicle’s lights stay protected. The included power wire must run up to the battery for proper circuit protection, keeping your setup safe and reliable over time.
Once connected, the 4-flat plug gives you everything you need for running lights, turn signals, and brake lights on most small and mid-size trailers. It’s the standard connection used across countless trailers and accessories, so you’ll be wired up for the basics without extra adapters or modifications.
Installing this Curt harness doesn’t require any ECU flashing or reprogramming. It simply reads your tail light signals and sends power to the trailer lights when those signals are active. The module stays out of your vehicle’s electronics, so safety sensors and driver-assist features continue working normally while you tow.
Customer Satisfaction Score:
96% were satisfied with this product
4% of customers were not satisfied
Ratings & Reviews
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Michael M.
2/18/2026
It has worked extremely well.