Checking the generator voltage (BMW 7 Series E32)

Connect the voltmeter to the battery terminals.

Start the engine. The voltage during the starting process may drop to 8 V (at a temperature of +20°C).

Increase engine speed to 3000 rpm. Voltage should be between 13.5 and 14.2 volts. This indicates that the alternator and voltage regulator are working properly. Alternator Voltage (voltage in the circuit) must be higher than the battery voltage so that the battery lights up while the car is moving.

Check the stability of the adjustment. To do this, turn on the high beam and repeat the measurements at 3000 rpm. The measured voltage should not differ by more than 0.4 V from the previously measured value.

If the measurement results differ from the specified values, the generator should be checked in a workshop.

(The article text was copied from an online resource: «BMWMAN.ru»)