Alternator and Regulator Circuit Test

1. Disconnect the wiring connector from generator.




2. With the engine stopped, turn starter switch to "ON" and connect a voltmeter between connector terminal Land ground or between terminal 16 and ground.

If voltage is not present, the line between battery and connector is disconnected and so requires repair.
3. Reconnect the wiring connector to the generator, run the engine at middle speed, and turn OFF all electrical devices other than engine.
4. Measure battery voltage. If it exceeds 16V, repair or replace the generator.




5. Connect an ammeter to output terminal of generator, and measure output current under load by turning on the other electrical devices (eg., headlights). At this time, the voltage must not be less than 13V.

Generator rating Ammeter reading
12V-60A 2OA
12V-75A 25A