In some cases and more often in europe the trailer light will be connected using a 13 pin plug and socket. Below is a diagram for the original plug and socket showing the functions of each pin.

Car Trailer Wiring Diagram Uk Trailer Caravan Electrical 12n
Wiring diagram for 7 pin trailer plug uk. In the trailer wiring diagram and connector application chart below use the first 5 pins and ignore the rest. How to wire a 7 pin trailer plug diagram shown. How to wire up a uk trailer lighting plug 1947 duration. This has now been replaced by 13 pin euro plugs on all new caravans. The table and diagram below explains the connections used on a 7 pin setup. Use the 7 pin connector anyway see below and just leave out the last 2 wires.
This supplies power to the road lighting of your trailer or caravan. This automobile is designed not just to travel one place to another but also to carry heavy loads. If you have a 13 pin socket fitted to your vehicle adaptors to plug in so you can use a normal 7 pin plug are available. You will need twin electrics if you require more power than what a single 7 pin socket can provide on a pre 2008 manufactured uk caravan post 2008 uk caravans are fitted with 13 pin connectors. If your truck has a built in 7 pin socket but you only need 5 of the pins. This guide will be discussing 7 pin trailer wiring.
The 7 pin n type plug and socket is still the most common connector for towing. 7 pin trailer wiring diagram uk 7 pin n type trailer plug wiring diagram uk 7 pin trailer wiring diagram uk trailer wiring diagram 7 pin round uk people understand that trailer is a vehicle comprised of quite complicated mechanisms. Twin electrics is a 2 plug system which combines the single 7 pin 12n electrics socket with a 12s electrics socket.