12s Wiring Diagram. Gm 12si wiring diagram. 7 pin s type plugs and sockets are usually used on caravans to supply power to the reverse light and give auxiliary power to other systems such as fridges internal lights and charging systemsthis was replaced in 2008 by the 13 pin euro plug on all new caravans.
The supply to 12s pin 2 for caravan battery charging has been customary practice in the uk for many years. The 12s cable sizes for post 1999 models have been increased to reduce voltage drop and improve load capacity. Earth for terminal 6.
Caravan 12s wiring diagram showing fridge battery charging live reversing light connections as well as the cable sizes from western towing.
Wire the socket as shown in chart b take the grey 7 core or 13 core cable into the boot through a suitable entry point. The supplies to 12s pins 2 and 6 must be installed such that they are live only when the vehicle engine is running see sections 3513 and 3515 below. There are some important differences in the 12s socket wiring in caravans manufactured prior to 1999 and after 1999. Wiring diagram for a 12n tow bar socket and plug.