Note: Before starting work, please read the safety precautions described in paragraph "Safety first!" and in paragraph 1 this chapter.
1. If the generator indicator lamp does not light when the ignition is turned on, first check for loose connections in the generator electrical connections. If everything is OK, check whether the bulb is burnt out and that the bulb holder is securely fastened to the instrument panel. If the lamp still does not light, check the integrity of the test lamp power wire running from the generator to the lamp socket. If everything is normal, then the generator is faulty. It should be replaced or taken to an auto electrician for inspection and repair.
2. If the generator indicator lamp lights up when the engine is running, stop the engine and check the condition and correct tension of the drive belt (see chapter 1A or 1B), as well as the reliability of the electrical connections of the generator. If everything is normal here, check the generator, and you should contact an automotive electrician for inspection and repair.
3. If you suspect that the generator is faulty, even though the test lamp is working properly, you can check the regulated voltage as follows.
4. Connect the voltmeter to the battery terminals and start the engine.
5. Increase the crankshaft speed until the voltmeter shows a stable voltage. The reading should be approximately 12-13 V, but not exceed 14 V.
6. Turn on the maximum number of electrical consumers (for example, headlights, rear window defroster and heater fan) and check if the generator supports regulated voltage in the range of 13-14 V.
7. If the regulated voltage is not within the normal range, the fault may be due to worn brushes, weakened brush springs, faulty voltage regulator, faulty diode, broken winding, or worn or damaged generator slip rings. The alternator should be replaced or taken to an auto electrician for inspection and repair.