Trailer Wiring Diagrams

This article is designed to be used as a guide to assist you with the maintenance and repair of your trailer and towing vehicles socket and plug wiring. If in doubt ask a specialist to inspect the trailer or towing vehicle.

7 PIN ROUND (Small & Large)

Pin 1 - Yellow - Left-hand turn indicator

Pin 2 - Black - Reversing signal

Pin 3 - White - Earth return

Pin 4 - Green - Right-hand turn indicator

Pin 5 - Blue - Service brakes

Pin 6 - Red - Stop lamps

Pin 7 - Brown - Rear lamps, clearance and side marker lamps

7 PIN FLAT

Pin 1 - Yellow - Left-hand turn indicator

Pin 2 - Black - Reversing signal

Pin 3 - White - Earth return

Pin 4 - Green - Right-hand turn indicator

Pin 5 - Blue - Service brakes

Pin 6 - Red - Stop lamps

Pin 7 - Brown - Rear lamps, clearance and side marker lamps