Caravanning Guide - Trailer Plug Wiring Diagrams
Trailer Plug Wiring Diagrams. Use the correct size cable for the plug/socket - most standard plugs will accept up to a 4mm auto cable easily. The 12-pin flat plug have a second row of 5 larger points which will accept up to 6mm auto cable. For best results, do NOT run battery charge lines, or fridge power lines through a 7-pin or 12-pin plug.
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