Stop wrestling with universal wiring kits that require cutting and splicing into your vehicle's tail-light circuits. The CURT 56310 is a vehicle-specific, plug-and-play T-connector harness engineered to mate directly with your factory wiring connectors -- no bare wires, no electrical tape, no guesswork. It delivers clean, reliable 4-flat trailer wiring so your trailer's running lights, brake lights, and turn signals sync perfectly with your tow vehicle every time you hook up.
The CURT 56310 belongs to CURT's extensive T-One Connector family -- one of the largest lineups of vehicle-specific trailer wiring harnesses in the aftermarket. Each T-One harness is engineered around a specific vehicle's OEM tail-light connector locations and pinouts, so installation comes down to unplugging the factory connectors, plugging in the T-connector in-line, and routing the 4-flat pigtail to your hitch receiver. No splicing, no soldering, no voiding of electrical warranties.
This harness is designed to draw power from the vehicle's existing tail-light circuits and pass those signals through to a standard 4-flat trailer connector (also called a 4-pin flat). That covers the four functions every trailer needs: left turn and brake, right turn and brake, running/tail lights, and ground. It is the correct connector for the vast majority of utility trailers, boat trailers, small cargo trailers, and popup campers that use a 4-flat plug.
Integrates with factory connectors behind the taillights -- zero wire cutting required. Preserves OEM wiring integrity and keeps your electrical warranty intact.
Standard 4-pin flat trailer plug covers running lights, left turn/brake, right turn/brake, and ground -- compatible with the majority of small trailers and boat trailers.
Engineered connectors match your tow vehicle's OEM tail-light harness plugs exactly -- no adapter pigtails or pin adapters needed at installation.
Molded connectors and sealed contact pins resist road moisture, salt spray, and vibration -- critical for trailer wiring that spends its life near the road surface.
CURT's T-One Connectors (also marketed as T-connectors or T-harnesses) sit in-line between your vehicle's OEM tail-light harness and the tail-light assemblies themselves. Because they tap into power that already exists and is already fused and controlled by the vehicle's body control module, they avoid the overload risks of a simple splice. No additional fusing or relays are required for basic 4-flat trailer lighting duties -- the circuit loading remains within OEM spec.
Most T-One installations take 20 to 45 minutes with basic hand tools. The general process for the 56310 follows the standard CURT T-One procedure:
The CURT T-One family covers hundreds of vehicles. Part number 56310 is specific to a defined vehicle application in CURT's catalog. Common trailer types that pair correctly with a 4-flat output harness include: