Standard Relay Wiring
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Circuit Opening Relay
A relay is an electrical switch that is commonly used in cars to control such electrical items as your headlights and thermo fan. The relay can be broken down into 2 circuits, The control circuit and the load circuit. As the current flows through the control circuit It creates a small magnetic field which causes the load circuit switch to close. Once the switch is closed Current can then flow through the load circuit. The main idea behind the relay is so you don't have to bring high current wires inside the cabin of the car as the relay is controlled remotely.