Towing Package Wiring Diagram
4 pin trailer wiring diagram.
Towing package wiring diagram. Check out or trailer wiring diagrams for a quick reference on trailer wiring. If your vehicle is not equipped with a working trailer wiring harness there are a number of different solutions to provide the perfect fit for your specific vehicle. To connect the electric system of your trailer to the vehicle you will be using special connector. If your truck has a built in 7 pin socket but you only need 5 of the pins.
Below is the generic schematic of how the wiring goes. Complete with a color coded trailer wiring diagram for each plug type this guide walks through various trailer wiring installation solution including custom wiring splice in wiring and replacement wiring. In the trailer wiring diagram and connector application chart below use the first 5 pins and ignore the rest. Use the 7 pin connector anyway see below and just leave out the last 2 wires.
Trailer wiring diagrams trailer wiring connectors various connectors are available from four to seven pins that allow for the transfer of power for the lighting as well as auxiliary functions such as an electric trailer brake controller backup lights or a 12v power supply for a winch or interior. You can use a circuit tester to verify connections.