1. Connect a voltmeter to the battery terminals.
2. Start the engine. At startup, the voltage may drop to 8 volts (at ambient temperature +20°С).
3. Increase the engine speed to 3000 rpm. The voltage should be between 1z and 14.5 volts. This proves that the generator and voltage regulator are working.
Generator voltage (onboard voltage) must be higher than the battery voltage so that it can be recharged while the vehicle is in operation.
4. Check the stability of the voltage regulator. To do this, turn on the main beam and repeat the measurement at an engine speed of 3000 rpm. The resulting voltage value should not exceed the previous value by more than 0.4 V.
If the values obtained during the measurement are outside the nominal values, check the generator in the workshop.