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Wiring a trailer shouldn’t mean cutting into factory wires. The Curt T-Connector Vehicle Wiring Harness with 4-Pole Flat Trailer Connector plugs directly into your vehicle’s tail light wiring for a simple, no-splice setup. It creates a secure factory-style connection that keeps your car’s wiring intact and protected.
This harness includes a powered converter that draws power directly from the car battery instead of the tail light circuit. That keeps your lighting signals strong and consistent, even when pulling trailers with extra lights or added load. You’ll run one hot lead up to the battery so the harness can safely power the trailer’s running, turn, and brake lights.
Everything connects in the rear cargo area, right behind the trunk panels. Once you remove the floor coverings and side liners, you’ll find the factory plug ready for this T-Connector to snap in. It’s a straightforward job with no need to trace wires or guess connections.
The 4-flat connector gives you what you need for towing small trailers or powering hitch-mounted lights—running, turn, and brake functions all in one weatherproof plug. It’s the most common connector style, so you can easily plug in trailers or accessories without extra adapters.

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