Trailer Wiring Diagram - Wiring Diagrams For Trailers 7-Way Trailer Connectors - Blade Style 7-Way trailer connectors are found on most recreational vehicles and are used on larger gooseneck, 5th wheel, boat and utility trailers. They supply power to the taillights, turn signals, brake lights, trailer brakes, reverse lights, auxiliary power and include a ground connection. GMC 7 Way Trailer Hitch Plug | GMC 7 Pin Trailer Wiring Need to replace a corroded or damaged Trailer Hitch Plug on your GMC model? Then shop at 1A Auto for a high quality, replacement 7 Way Trailer Wiring Harness Connector, and get your GMC trailer lights and / or electric braking systems in good form again. 1A Auto has a large selection of aftermarket, 7 Pin Trailer Hitch Electrical Connectors for your GMC and ground shipping is always free! Related searches for gmc trailer wiring 7 wire 7 pin gmc trailer wiringgmc 7 way trailer diagramgm trailer wiring harness diagramchevrolet trailer wiring diagramchevrolet truck trailer wiring diagramchevrolet trailer plug wiring diagram6 pin trailer connector wiring diagramgmc trailer wiring