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Wiring a trailer doesn’t have to mean splicing into factory wires. The Curt T-Connector Vehicle Wiring Harness with 4-Pole Flat Trailer Connector plugs directly into the vehicle’s existing wiring, creating a hidden, plug-and-lead connection. It’s built for a clean install with no cutting and no guesswork, so you get a tidy setup that looks factory-finished.
This harness comes with an integrated converter that takes care of the electrical load differences between vehicle and trailer circuits. It ensures your trailer running lights, brake lights, and turn signals all operate properly, even with LED lights or sensitive vehicle systems. That means reliable performance every time you connect your trailer.
If you ever need to tow a trailer with a 7-way connector, this 4-flat harness can be paired with an adapter like the Hopkins 4-to-7 adapter #37185. You simply connect the 4-way plug and ground the adapter using its white wire with ring terminal. Add a kit like #5506 to bring in 12V power or brake controller use when needed—no rewiring required.
The harness doesn’t come with a mounting bracket, giving you flexibility in how you secure it. You can pair it with Curt’s Mounting Bracket #18144 or choose a No-Drill Mounting Bracket—short #18140 or long #C57202—for a simple install that keeps your connector easy to reach without drilling into your hitch.

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