Start the engine and set the speed to about 2000 rpm. The voltmeter under these conditions should show 13.7-14.6 V. If the voltmeter readings exceed 14.6 V, the generator regulator is faulty and requires replacement.
If the voltmeter reading is less than 13.5 V, this means that either the regulator is faulty or the regulator brushes are shorted.
Remove the regulator located at the rear of the generator (Fig. 7.2).
Install the brush holder. Close the clamps "Dr" and "DF". Turn on the test lamp between the following clamps: positive battery clamp and "Dr" or "DF".
If the generator is not damaged, the indicator light will be on when the engine is not running and will go out when the engine is running.
If the indicator light is flashing, the stator winding is damaged or the diodes are faulty.
The regulator is also a brush holder and must be replaced as a set.