Heavy Duty 30 Amp Automatic Caravan Battery Charging Relay with Voltage Sensor Required when installing 12S or full 13 pin towing electrics for caravan auxilliary circuits Suitable for use with the larger fridge and leaisure batteries installed in modern caravans. Voltage sensor circuits in the relay monitor the power supply from your car and switch to caravan battery charging when your car's engine is running and the car battery is charging.

12S Wiring

• Pin 1 Yellow Reverse Light
• Pin 2 Blue Spare
• Pin 3 White Earth Return for
• Pin 4 Green Constant 12V (interior lights, battery charging)
• Pin 5 Brown Sensor (not usually used)
• Pin 6 Red Refrigerator
• Pin 7 Black Earth Return for Pin 6

 A full range of towing relays are also available, see our Ebay shop for details. From basic audible to 7 way electronic by-pass. We also stock a large range of vehicle specific wiring kits for use with CAN BUS systems, these are essential for the correct operation of vehicle safety systems on many new cars (TSP, ESP etc.)