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Automotive Relays and How They Work. Automotive relays of all shapes and sizes can be found in just about every car, truck, and even boats. Relays in general are used to enable a low amperage circuit to switch on or off a higher amperage circuit, like turning on your headlights.f you were to try and directly hook up your headlights to the headlight switch you would exceed the amperage rating of the switch, melt wires, and risk an electrical fire. Relays are also used to switch multiple things at the same time using one output.
Top 10 unbelievable historical concurrencies. An electrical relay is a switch that is under the control of another circuit. A classic example is the system used to start a car â when someone turns an ignition key, the ignition does not interact directly with the car battery. Instead, it activates a relay, which passes the signal on so that the car can start.