Alternator voltage test

1. Connect a voltmeter to the positive and negative poles of the battery.

2. Start the engine. The voltage during startup should drop to 8V (at outside temperature +20°С).

3. Raise the engine speed to 3000 rpm. The voltage should be 13.5-14.5 V. This is proof that the generator and regulator are working. Generator voltage (onboard voltage) the battery voltage must be higher in order for the battery to be charged during operation.

4. Check the stability of the regulator. To do this, turn on the main beam and repeat the measurement at 3000 rpm. The measured voltage should not exceed the previously measured voltage by more than 0.4 V.

5. If the measured values are outside the required value, have the alternator checked by a workshop.