Opel Corsa B 1993–2000 Service and Repair Manual: Charging system - testing

Note: Refer to the warnings given in "Safety first!" .

1. If the ignition warning light fails to illuminate when the ignition is switched on, first check the alternator wiring connections for security.

If satisfactory, check that the warning light bulb has not blown, and that the bulbholder is secure in its location in the instrument panel.

If the light still fails to illuminate, check the continuity of the warning light feed wire from the alternator to the bulbholder. If all is satisfactory, the alternator is at fault and should be renewed or taken to an autoelectrician for testing and repair.

2. If the ignition warning light illuminates when the engine is running, stop the engine and check that the drivebelt is correctly tensioned and that the alternator connections are secure. If all is so far satisfactory, have the alternator checked by an auto-electrician for testing and repair.

Starting and charging systems
Disconnect the battery negative terminal first

3. If the alternator output is suspect even though the warning light functions correctly, the regulated voltage may be checked as follows.

4. Connect a voltmeter across the battery terminals and start the engine.

5. Increase the engine speed until the voltmeter reading remains steady; the reading should be approximately 12 to 13 volts, and no more than 14 volts.

6. Switch on as many electrical accessories (eg, the headlights, heated rear window and heater blower) as possible, and check that the alternator maintains the regulated voltage at around 13 to 14 volts.

7. If the regulated voltage is not as stated, the fault may be due to worn brushes, weak brush springs, a faulty voltage regulator, a faulty diode, a severed phase winding or worn or damaged slip rings. The alternator should be renewed or taken to an auto-electrician for testing and repair.

    Battery - removal and refitting
    Removal 1. The battery is located on the left-hand side of the engine bay. 2. Slacken the clamp nut and bolt on the negative (-) terminal clamp (see illustration). Lift the clamp off the termin ...

    Alternator drivebelt - removal, refitting and tensioning
    Refer to the procedure given for the auxiliary drivebelt(s). Alternator - removal and refitting Removal 1. Disconnect the battery earth (negative) lead. 2. Make a note of the electrical connect ...

    See also:

    Opel Corsa Owners Manual. Interruption of power supply, Manual transmission
    Interruption of power supply In the event of an interruption of power supply, the selector lever cannot be moved out of the P position. If the battery is discharged, start the v ...


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