Add trailer lighting capability to your tow vehicle the right way -- without cutting, splicing, or taping into factory wires. The CURT 55567 T-One connector integrates directly with your vehicle's existing tail light wiring harness, delivering clean, reliable trailer signals in a fraction of the time of traditional wiring jobs. Whether you're towing a pop-up camper, utility trailer, boat trailer, or small travel trailer, this is the starting point for a legal, safe lighting connection.
The CURT T-One (T-connector) system is one of the most popular trailer wiring solutions on the market for good reason. The harness is engineered to plug directly into your vehicle's existing tail light sockets or OEM wiring connectors, acting as a pass-through that simultaneously feeds your trailer's turn signals, brake lights, and running lights without disrupting the vehicle's original electrical system.
Part number 55567 is a vehicle-specific fitment within CURT's extensive T-One lineup. Rather than a universal splice-in kit, this connector is shaped and keyed for the exact connectors found on the compatible tow vehicles it serves, ensuring a secure, moisture-resistant fit. The result is a professional-looking install that a dealer could charge significant labor for -- done in your driveway in under an hour.
Plugs directly into OEM tail light connectors. Zero wire cutting means no voided warranties and no risk of shorts from improper splicing.
Outputs a standard 4-pin flat trailer connector -- the universal standard for most utility, boat, and small travel trailers across North America.
Engineered as a direct plug-in for compatible vehicle tail light harness connectors. No adapter guesswork, no universal trimming required.
Transfers left turn/brake, right turn/brake, running/taillights, and ground -- all four functions required for legal trailer operation in all 50 states.
The T-One sits between your vehicle's tail light bulb socket (or OEM wiring plug) and the original connector, acting as a signal splitter. It reads the same signals your vehicle's taillights use and replicates them on the 4-flat trailer connector pigtail that hangs at the rear of your vehicle, ready to mate with your trailer's 4-flat plug.
The 4-flat output connector on the CURT 55567 is compatible with the vast majority of trailers used in the recreational and utility markets:
Installation is straightforward and requires no special tools beyond basic hand tools to access the taillight area. General process for most vehicles: