Note: Please read the warnings in section "Safety first!" and in section 1 this chapter.
1. If the ignition indicator light does not come on when the ignition is turned on, check the alternator wiring connections first. If the wiring is OK, check that the indicator bulb is not burnt out and that the bulb socket is securely fastened to the instrument panel. If the indicator still does not light up, check the integrity of the indicator wire from the generator to the light bulb socket. If everything is in order, then the generator is faulty - it should be replaced or given to an auto electrician for inspection and repair.
2. If the ignition indicator light stays on after starting the engine, stop the engine and check that the alternator drive belt is properly tensioned (see chapter 1) and whether the wires to the generator are securely attached. If all this is in order, take the generator to an auto electrician for inspection and repair.
3. If the indicator light is working normally, but the generator is in doubt, you should check its output voltage as follows.
4. Connect a voltmeter to the battery terminals and start the engine.
5. Increase the speed of the engine until the voltmeter reading becomes stable: the voltmeter should show from 12 to 13 V and not higher than 14 V.
6. Turn on as many electrical devices in the car as possible: headlights, rear window defroster, blower fan, etc. and check if the alternator supports a regulated voltage between 13 and 14 V.
7. If the regulated voltage is not as specified, the causes of the malfunction may be worn brushes, weakening of the brush springs, a malfunction of the voltage regulator, a defective diode, an open phase winding, worn or damaged collector rings. Replace the alternator or have it checked and repaired by an auto electrician.