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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.
The other function, of course, is to blow the horns. The relay gets it's power from the buss bar, and is one of the few circuits without a fuse. The green wire is the other normally open contact. When the relay is energized, power passes to this wire.