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Trailer Wiring Connector; T Connector; With 4 Way Flat Trailer ConnectionA CURT custom wiring harness also called a T-connector is a simple plug-and-play electrical device that eliminates the need for cutting splicing and soldering when installing vehicle-to-trailer wiring. Most vehicles do not come ready to tow. Unless your vehicle has a towing package it is probably not equipped with a trailer wiring connector. This is where CURT’s custom wiring harnesses come into play. Custom wiring harnesses plug into your vehicle’s electrical system using original equipment OEM connectors. Our custom wiring harnesses use two or more OEM connectors to plug in at the taillight assembly and provide a standard trailer socket to allow a trailer to be plugged into your vehicle’s power system.