- a) Check the reliability of the fastening of the wire clamps to the battery terminals.
- b) Check the battery condition (see paragraph 3). If the battery is faulty, replace it.
- c) Check the generator wires and their connections.
- d) Check the condition and tension of the generator drive belt.
- d) Check that the generator mounting bolts are securely tightened.
- e) With the engine running, listen for any unusual sounds from the generator.
- g) Check the MAIN fuse (100 A) and ENG INJ fuse (30 A) in the fuse box in the engine compartment.
- h) Check if the discharge lamp on the instrument panel lights up when the ignition is turned on (the engine is not working). If the light does not come on, disconnect the 2-pin connector on the back of the generator and disconnect the ground wire from the L terminal. The discharge light should come on (figure 11.1). If the light does not light, check the METER fuse (15 A). If the fuse is blown, replace it. If the fuse is intact, check the indicator light.
2. With the ignition on and the engine not running, turn off all consumers and check the voltage at the generator terminals:
- a) There should be battery voltage between terminals 9 and S.
- b) There should be a voltage of about 1 V at pin L.
3. Start the engine and let it idle. Check the voltage at the generator terminals again:
- a) There should be a voltage of 14.1-74.7S between terminals 3 and S.
- b) The voltage at pin L should be 13.2-13.8 V
4. Observe the change in voltage as the load on the on-board network increases. Turn on the high beam headlights, the air conditioner fan at high speed, the windshield wipers and the audio system. When each subsequent consumer is turned on, the voltage at terminal B should drop and then return to its original position. If the charging system is functioning properly, the voltage should not drop below 13.5 V. If the voltage drops below 13.0 V, there is a fault in the charging system.
5. With the engine idling, check the battery charge voltage. It should not be below 13 V.
Note: Some low-power alternators may drop voltage when the RPM drops below 13 V, however, if the charging system is working properly, the voltage should return to its previous level.
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6. Turn off the electrical load, accelerate the engine to 1600 rpm and observe the charging voltage. It should increase, but not above 15 V.
Note: At low temperatures the voltage should be slightly higher, but it should decrease as the engine warms up.
7. If the charging voltage does not change with changes in speed and when connecting and disconnecting the load, then the voltage regulator is faulty. If the charging voltage is significantly lower than specified, the generator is faulty. In this case, replace the generator together with the voltage regulator.