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A multi-purpose relay is an electrical component used to connect electrical power from the vehicle's battery to various electrical systems. Relays open and close to connect and disconnect the flow of power to control modules and accessories. These relays are versatile and can serve different purposes within an electrical system, and are designed to serve many vehicle applications, such as headlights, fuel pumps, and cooling fans. Wiring relays allow signals to be sent to and from sensors, switches, or other controls. A multi-purpose relay may be found in many different vehicle applications to connect accessories and systems to power, or to communicate with onboard control modules. If a wiring relay or multi-purpose relay is damaged or wears out, parts controlled by the relay may not function, or may only function intermittently. If you need replacement wiring relays, or want to install a multi-purpose relay to control aftermarket accessories, shop O'Reilly Auto Parts, where we carry a variety of multi-purpose relays and other electrical components for a complete repair.