Datsun Models

Ensure battery has a full charge, then connect a 30-volt voltmeter as shown in illustration, and test as follows:

Fig 1: Disassembled View of Typical Hitachi Alternator

Courtesy of NOT AVAILABLE

Fig 2: Alternator Testing Connections for Datsun

Courtesy of NOT AVAILABLE

1. Detach connectors at alternator. Connect a test probe from voltmeter positive terminal to "N" or "BAT" terminal. Connect other test probe to ground. Check that voltmeter registers battery voltage.
2. Turn on headlights to high beam. Start engine and increase speed to approximately 1000 RPM and observe voltmeter. If voltmeter registers below 12.5 volts, alternator is defective. If above 12.5 volts, alternator is good.