A relay is nothing more than a very heavy-duty switch that does a lesser switch’s bidding. A small electromagnetic engagement coil consumes on the order of milliamps means just about any switch can activate it.
Thealternator is powered by the engine connected by a serpentine belt. This unit creates electrical power by utilizing a magnetized armature and outer copper windings which are connected to the battery using brushes. While in operation (engine running) this unit supplies electrical power for the vehicle while charging the battery at the same time.
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