Alternator & Regulator: Description

The Motorcraft Integral Alternator/Regulator (IAR) with internal fan uses a solid-state voltage regulator mounted to the rear housing. The charging system consists of an alternator/regulator assembly, charge indicator (light or gauge), battery and required circuitry. Charging systems are equipped with a fusible link, used to prevent system damage. Some models are equipped with indicator lights while others use voltmeters. See Figure.

When the ignition is turned on, voltage is applied through the charge indicator circuit "I" to the voltage regulator. The voltage regulator is activated and allows current flow from the battery to the alternator field circuit through circuit "A". When the engine is started, the rotation of the alternator creates AC current, which passes through the rectifier assembly where it is converted to DC current. DC current is supplied to the vehicle's electrical system by the output terminal located on the rear housing.