Profile: Auto Sparks supplies classic car wiring harnesses, cables and electrical components. We produces a range of wiring harnesses for classic motorcycles, cars, tractors and commercial vehicles. We also supply original equipment harnesses to smaller volume manufacturers including such diverse applications as some of the top British sports cars, European roadsweepers and a range of emergency vehicles. Our radio changeover unit diverts the supply power from the vehicle battery to the leisure battery when the ignition is off. This allows extended use of the Audio equipment whilst parked up on long weekends and festivals without the risk of draining the vehicle battery. Once the vehicle ignition is switched back on, the Audio reverts to taking its power from the vehicle battery. Our volton combi relay is suitable for connecting a 12S towing electrics where split charging and a supply for the fridge is required , to any car or light commercial vehicle, including vehicles which have multiplexed bulb failure, digital controlled lighting, mixed voltage lighting systems or low voltage side light systems.