Caravan 12 Volt Systems 12 volt systems are powered from an onboard battery, and provide power for the water pump, as well as strip lighting and a toilet pump. 12 volt systems allow you to keep your lights on and still use your water pump if there is a loss of mains power – as long as your battery is charged.

Whats the difference between 7 and 13 pin towbar?

The difference between a 7-pin and 13-pin plug is that a 13-pin plug has more functions. A 7-pin plug only supplies in basic lighting, such as blinkers and brake lights. The additional pins in the 13-pin plug are used for the reversing lights and the rear mist light, among other things.