7-Pin Trailer Wiring Explained: UK Wiring Diagram, Pin Functions and Common Faults
7 pin trailer wiring diagrams can help you identify which wire controls each trailer lighting function and diagnose common faults. This guide explains the standard UK 12N wiring layout, including indicators, tail lights, brake lights, fog lights and the earth connection. We also explain the difference between 7-pin and 13-pin trailer plugs, and when a damaged plug or wiring…