Preparing for the test
1. Before testing, check the following items:
- the battery installed in the car must be fully charged;
- Check alternator drive belt tension.
2. Turn the ignition key to position "OFF".
3. Disconnect the wire from the negative battery terminal.
4. Connect a digital voltmeter between the terminals "S (L) " generator and "weight". Connect the positive probe of the voltmeter to the terminal "S (L) " generator.
5. Disconnect the wire from the terminal "B" generator.
6. Connect a DC ammeter with a range of 0-100 A in series between the terminal "B" and a wire disconnected from the generator. Make sure that the ammeter negative probe is connected to the wire disconnected from the generator.
7. Connect the tachometer and wire to the negative battery terminal.
Examination
1. Check that the voltmeter scale is clearly visible to determine the voltage value.
The voltmeter should indicate battery voltage.
If the voltmeter shows a voltage of 0 V, then the electrical circuit connecting the terminal is not closed "S (L) " alternator and positive battery terminal, or fuse blown.
2. Start the engine and turn off all electrical consumers.
3. Increase the engine speed to 2,500 min-1 and when the current decreases to less than 10 A, read the voltage on the voltmeter.
Result of checking
1. If the voltage matches the required value, then the voltage regulator is good and working properly. If the voltage differs from the required one, then the voltage regulator or generator is faulty.
Voltage regulator temperature,°C | Voltage regulation, V | |
Generator 75A | Generator 90A | |
–20 | 14,2–15,4 | 14,3–15,2 |
20 | 13,9–14,9 | 14,1–14,7 |
60 | 13,4–14,6 | 13,5–14,4 |
80 | 13,1–14,5 | 13,3–14,3 |
2. After completing the alternator current limit test, run the engine to idle and turn off the ignition.
3. Disconnect the wire from the negative battery terminal.
4. Remove the tachometer, voltmeter and ammeter.
5. Connect wire to terminal "B" generator.
6. Connect the wire to the negative battery terminal.