The Ultimate Trailer Plug Wiring Chart

Photo by Airstream Inc. on Unsplash

I’ve been working on converting all my trailers and cars to 13-pin plugs and sockets lately, as I got fed up with corroded connectors and adapters. What I quite quickly ran into was the issue of finding a reliable chart on how to change a car or trailer over to 13-pin from 7-pin. So I made this chart with my findings so far. I still have some vehicles left, so there might be some updates to this chart in the future.

 

7-Pin Pin Numbers 7-Pin Wire Colours 13-Pin Pin Numbers Function Bosch 7-Pin IDs 90’s Volvo 7-Pin Wire Colours
1 Yellow 1 Left Indicator L Green
2 Blue 2 Rear Fog Lamp 54g Red
3 White 3 Earth (for circuits 1 to 8) 31 Black
4 Green 4 Right Indicator R Blue
5 Brown 5 Right Tail Lamp, Side Lamp and Numberplate Lighting 58R Grey
6 Red 6 Braking Lights 54 Yellow/Brown
7 Black 7 Left Tail Lamp, Side Lamp and Numberplate Lighting 58L White
N/A N/A 8 Reversing Lights N/A N/A
N/A N/A 9 Power Supply (Permanent Positive) N/A N/A
N/A N/A 10 Positive Charging Lead for Battery in Trailer N/A N/A
N/A N/A 11 Not Allocated N/A N/A
N/A N/A 12 Not Allocated N/A N/A
N/A N/A 13 Earth (for circuits 9 to 12) N/A N/A
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