2. If the lamp does not turn on at all, disconnect the multi-pin plug connector from the generator, turn on the ignition and short the "L" terminal wire to ground. If the lamp lights up, the generator is faulty (check the generator brushes and rings first). If the lamp does not light, there is a break in the wire to the generator or the lamp is faulty. If necessary, replace the lamp. Finally, connect the generator.
3. If the lamp does not turn on at all, this must be due to a short circuit, most likely in the wire from the lamp to the generator, a short circuit in the generator is also possible.
4. If the lamp lights up but does not go out when the engine is running (brightness can change with engine speed) check the drive belt first. If the drive belt is in good condition and adjusted correctly, the damage may be due to a faulty diode in the rectifier diode assembly. The rectifier diode assembly can be replaced separately.
5. If the lamp functions normally, but there are faults in the charging system, first check the drive belt. Check the condition and reliability of the generator and battery wiring.
6. Accurate determination of the generator output power requires special equipment and skill. Roughly, the power can be determined using a voltmeter (range 0-15 or 0-20 V) as follows.
7. Connect the voltmeter to the battery. Turn on the headlights, measure the voltage: it should be 12-13 V.
8. Start the engine, set it to idle mode (approximately 1500 rpm). The voltmeter readings should be 13-14 V.
9. With the engine running in fast idle mode, turn on all possible electrical consumers (rear window heater, heater fan, etc.) The battery voltage should be maintained in the 13-14V range. Increase the engine speed slightly if necessary to establish the voltage.
10. If the generator output is low or zero, check the brushes. If the brushes are normal, repair the generator.
11. Sometimes a condition may arise where the generator output is excessive (that is 14.5 V or more). This could be due to a faulty voltage regulator.