The alternator works together with the battery to supply power for the electrical components of the vehicle. When the alternator pulley is rotated, alternating current (AC) passes through a magnetic field and an electrical current is generated. This is then converted to DC via the rectifier. It supplies power to all electric devices except the starter motor. If there is excess energy, the alternator charges the battery. Buy Delcoribo alternators, and get best charging devices for vehicles.