ALTERNATOR EXPLAINEDAn alternator is a generator of electric power in a car and is a major component of the vehicle's charging system. All cars with an internal combustion engine except for some hybrids have an alternator. When an engine is running, the alternator charges the battery and supplies additional electric power for the vehicle's electrical systems. An alternator is bolted to the engine and is driven by a serpentine belt (drive belt).An alternator is a maintenance-free unit. In some ca