A car relay is an electromagnetic switch, which turns on and off when power is applied to a coil. This then indicates when a power wire to a certain component is connected or disconnected hence forming a relay of information. They are used within multiple electronically controlled systems including lighting and alarm aspects of your car. At Aceparts.co.uk we stock a wide range of quality relays for all types of cars and vans, so we're 99.9% sure we will have the relay you require. Be sure to order online with Aceparts for a hassle free, money saving experience.