1 - fixing bolt;
2 - mounting bracket;
3 - tension bolt.
If you have any doubts about the correctness of the voltage regulator, then you can check its operation:
1. Connect a voltmeter to the positive pole of the alternator and the negative pole of the battery.
2. The engine must be running at 4000 rpm.
3. With a load of 3 to 7 A (e.g. lights on and heated rear window or heating fan) voltage must be between 13.5 and 14.8 V.
4. If during measurement the voltage turned out to be higher, then the voltage regulator is faulty and must be replaced.
5. Worn graphite brushes may be the cause of lower voltage.
Checking and replacing graphite brushes
For check at any type of the engine it is necessary to remove the generator. If the alternator has already been removed, it is recommended that the alternator be checked by a workshop. The necessary gauges and tools are available there, and other faults, such as mechanical faults, can be detected and repaired there.
1. Place the generator on a workbench and unscrew the 2 screws in the voltage regulator.
2. Slightly open the voltage regulator to have access to the graphite brushes.
3. Measure the protrusions of the sliding graphite brushes.
4. If they are about 5 mm long, then, depending on the type of generator, either a voltage regulator together with graphite brushes, or the graphite brushes themselves with a holder.