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Alternator & Regulator: Description

On Metro models, a Nippondenso 50-amp alternator is used. See Fig 1. On Prizm and Prizm GSi, a Nippondenso 60-amp alternator is used. See Fig 2. Alternator utilizes an internal voltage regulator. The Integrated Circuit (IC) regulator is a solid state unit that is mounted inside alternator to rear end frame. Voltage regulator voltage cannot be adjusted.

Fig 1: Charging System Wiring Schematic (Metro)
G91B02009Courtesy of GENERAL MOTORS CORP.
Fig 2: Charging System Wiring Schematic (Prizm & Prizm GSi)
G91D02010Courtesy of GENERAL MOTORS CORP.

Two brushes carry current through 2 slip rings to field coil mounted on rotor. Stator windings are assembled inside a laminated core forming part of alternator drive and frame assemblies. A rectifier bridge containing 6 diodes (8 diodes on Prizm and Prizm GSi) is connected to stator windings.