What Does a Relay Do?
Before we discuss how to tell if a relay is bad in a car, let’s cover the purpose of a relay. Relay switches are used to reduce the amount of electric current that’s flowing through a particular circuit inside your car. It takes a huge amount of amperage to operate some of the vehicle’s functions. As such, allowing all of it to go through a switch without a relay could cause the switch to burn a lot faster.
Relays are used with headlights, the car’s horn, automatic windows, air conditioning, and other functions that require a circuit. They are designed to take on the excessive amperage but can also burn out after some time.
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