Stop wrestling with spliced wires and electrical tape. The CURT 55329 T-One connector plugs directly into your vehicle's factory tail light harness, delivering a clean, reliable 4-flat trailer wiring hookup with zero cutting or splicing required. Get your trailer's running lights, brake lights, and turn signals working the right way -- the first time.
The CURT 55329 is part of CURT's T-One connector family, one of the most widely used vehicle-specific trailer wiring solutions in the aftermarket. Unlike universal wiring kits that require you to tap into and splice existing wires, the T-One design uses a pass-through connector that plugs in between your factory tail light harness and the tail light itself. Your factory wiring stays completely intact.
The result is a weatherproof, factory-looking installation that preserves your vehicle's original electrical system and won't void factory warranties related to wiring modifications. CURT engineers each T-One harness to match the specific plug-and-socket configuration of the target vehicle, so the connectors simply click in with no guesswork.
Plugs directly into the factory tail light socket. Your stock wiring is never touched or modified.
Standard 4-pin flat connector delivers running lights, left turn/brake, right turn/brake, and ground to your trailer.
Engineered to match factory harness connectors on specific tow vehicles -- no universal adapter fumbling.
Molded connector body and sealed contacts resist moisture, road grime, and corrosion common on RV tow vehicles.
The 4-flat (also called 4-pin flat) is the standard light connector for most small-to-mid-size trailers, including:
The four circuits carried by this connector are: TM (tail/running lights), LT (left turn and brake), RT (right turn and brake), and GD (ground). If your trailer also needs electric brakes or a 12V aux circuit, you would need a 5-flat or 7-way connector -- but for light-duty towing without electric brakes, the 4-flat is the correct and most common choice.
CURT manufactures dozens of T-One connectors, each coded to a specific vehicle application. Part number 55329 is a vehicle-specific unit within this series. Always verify the vehicle fitment chart (by year, make, model, and trim/package) before ordering, as two trucks from the same model year can have different tail light harness configurations depending on the factory package installed.
Installation typically takes 15-30 minutes with basic hand tools and requires no electrical knowledge beyond plugging in connectors: