Datsun Models
Ensure that battery has a full charge, then connect 30-volt voltmeter as illustrated in Fig 1. Turn ignition switch "ON" and test as follows:
- If charge light remains OFF, disconnect connector from rear of alternator and ground "L" lead wire. If light remains OFF, replace indicator bulb. If light is ON, reconnect connector and ground "F" terminal by touching brush with grounded wire. If light stays on, replace IC regulator. If light goes out, remove and repair alternator.
- If light came ON when ignition was turned "ON", start and idle engine. If light is dim, flickers or remains bright, remove and repair alternator. If light went off at idle, run engine at 1500 RPM and turn headlights on high beam. If charge light is on dim, idle engine and measure voltage between terminals "B" and "L". If less than 0.5 volt, alternator is OK. If more than 0.5 volt, remove and repair alternator.NOTE: Terminals "S", "L", "BAT" and "E" are marked on rear cover of alternator.
- If charge light went OFF at 1500 RPM with lights on high beam, measure "B" voltage. If more than 15.5 volts, replace IC regulator. If 13 to 15 volts, idle engine and check indicator light. If OFF, system is OK. If ON, repair faulty alternator.