Caravanning Guide - Trailer Plug Wiring Diagrams | Caravan 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. Guide to Trailer Plugs: Towing and Charging Solutions Feb 15, 2018Hi Norm, It all depends on how the Caravan and car are wired. Typically the Fridge runs through a 12 pin plug as the extra pins are designed to handle the bigger load. Most 7 pin plugs are not set up to run a fridge as the connections cannot handle it. Wiring 13 pin euro trailer plug & sockets Wiring Diagram for a 13pin Euro trailer plug. Below is a diagram of a 13 Pin Euro trailer plug with coloured pins as they are wired. On the rear of the pins the numbers are marked in the plastic next to each pin. The pins usually have a small screw to retain the wire on the back. When assembling a plug always remember to slide any gromets and caps down the cables before you start to attach cables.
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