Detailed 7-pin trailer plug wiring diagram, including color codes and pinout configuration for easy installation and troubleshooting.. Need a wiring diagram for a 7 wire trailer plug? Find detailed instructions and diagrams to help you wire your trailer for maximum safety and functionality.
Here is the general 7 pin wiring diagram that is used on most trailer, caravan and towbar wiring, it applies for both plugs and sockets fitted to trailers or caravans that have the 7 pins. Want to replace or repair your current 7-pin trailer plug? The wiring diagram below explains the function of each pin and the most common wire colours. In some trailers, both tail lights may be joined on a single wire. If that's the case, connect that wire to pin 7.