A key component of an automobile's charging system, which provides current to recharge the battery and develops electricity to power all other electrical components when the engine is running, is the alternator. The other component of the charging system is the voltage regulator. The basic function of the alternator is to generate the electricity required to start and run the automobile, while the regulator is designed to control the amount of voltage that circulates through the system. An alternator consists of rotor assembly, a stator assembly, and a rectifier mounted in a housing.