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Adding trailer lighting doesn’t have to mean chasing wires or cutting into factory harnesses. The Curt T-Connector Vehicle Wiring Harness with 4-Pole Flat Trailer Connector simply plugs into your vehicle’s existing wiring, giving you a clean, plug-and-play setup. It’s designed for vehicles without a tow package and includes a powered converter so the trailer lights run off a direct battery feed instead of pulling power from the vehicle circuits.
With its built-in powered converter, this harness draws power straight from the battery to operate the trailer lights. That means steady, dependable current for running lights, turn signals, and brake lights—even when towing a fully loaded trailer. The converter isolates the vehicle wiring from the trailer load to prevent shorts or overloads that could damage the factory lighting system.
Starting with a solid 4-way connection makes it simple to add more capability later. This harness gives you a standard 4-flat plug that handles all the basic lighting functions and can be converted to a 7-way using an adapter like part #37185 or part #ETBC7. That makes it ready for brake controllers or trailer charging circuits when you need them.
Once installed, the wiring tucks neatly out of view thanks to its hidden plug-in layout. The leads route through existing spaces so there’s no need for drilling or exposed wires hanging below the vehicle. The finished look stays clean, while the weather-resistant connectors protect your signals from moisture and corrosion over time.
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