1. Before the test, check the following items:
- Check the fastening of the generator and the reliability of wiring;
- the state established in the car battery;
- alternator drive belt tension;
- lack of noise emitted by the generator when the engine is running.
2. Turn the ignition switch to "OFF".
3. Disconnect the negative battery terminal.
4. Connect the digital voltmeter between the terminals "S" of the generator and "weight". Connect the positive lead of the voltmeter to the terminal "S" of the generator
5. Disconnect the wire from the plug "B" of the generator.
6. Connect the DC ammeter to measure the limit of 0-100 A in series between the terminal "B" and disconnected from the alternator wire. Make sure that the negative probe of the ammeter connected to the generator disconnected from the wire.
7. Connect the cable to the negative terminal of the battery.
8. Connect a tachometer.
9. Make sure that the voltmeter shows battery voltage.
If the voltmeter shows voltage of 0V, then do not complete an electrical circuit connecting the terminal "S" of the generator and the positive (+) terminal of the battery.
10. Turn off all electric power consumers.
11. Start the engine.
12. Increase the engine speed to 2500 min -1.
13. When the current is reduced to less than 10 A, read the voltage value on the voltmeter.
14. If the voltage corresponds to the desired value, then the voltage regulator is undamaged and functioning properly. If the voltage is not correct, it means that the voltage regulator or a faulty generator.