Towing Package Wiring Diagram
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.
Towing package wiring diagram. Below is the generic schematic of how the wiring goes. 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. If your truck has a built in 7 pin socket but you only need 5 of the pins. 4 pin trailer wiring diagram.
In the trailer wiring diagram and connector application chart below use the first 5 pins and ignore the rest. Check out or trailer wiring diagrams for a quick reference on trailer wiring. Use the 7 pin connector anyway see below and just leave out the last 2 wires. You can use a circuit tester to verify connections.
The below information is for reference and is commonly used throughout the industry but can vary depending on who built the trailer. 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.