Fig. 19.4. Connecting wires and devices to the generator when checking the generator output current of the 4G9 engine
Fig. 19.5. Connecting wires and devices to the generator when checking the generator output current of the 4G1 engine
This test allows you to determine whether the generator output current corresponds to the nominal value.
1. Before testing, check the following items:
- generator status;
- battery status;
- alternator drive belt tension;
- burn-through fuse link;
- absence of abnormal noise from the generator when the engine is running.
Note: The battery must be partially discharged. If the battery is fully charged, the test cannot be performed due to insufficient load on the generator.
2. Turn off the ignition.
3. Disconnect the cable from the negative terminal of the battery.
4. Disconnect the wire from the B terminal of the generator. Connect a DC ammeter with a 0-100 A range in series between the B terminal and the wire disconnected from the generator. Make sure that the negative probe of the ammeter is connected to the wire disconnected from the generator.
Warning: Do not use clamps to connect wires and devices, but tighten connections with bolts and nuts. Otherwise, an unreliable connection may cause an accident.
5. Connect a voltmeter with a 0-20 V measurement range to the B terminal of the generator and to ground. Make sure that the positive probe of the voltmeter is connected to the B terminal of the generator.
6. Connect the cable to the negative terminal of the battery.
The article is based on data from the website (MitsubishiMan.ru)
7. Connect the tachometer or MUT-II device.
8. Leave the hood open.
9. Make sure the voltmeter shows voltage at the battery terminals. If the voltmeter shows 0 V, the fuse has blown or the electrical circuit between the B terminal of the generator and the positive terminal of the battery is not closed.
10. Start the engine and turn on the lights and headlights.
11. After turning on the high beam headlights and the heater fan in the maximum air supply mode, immediately briefly increase the engine speed to 2,500 min⁻¹ and read the values on the instruments, while the ammeter will show the current supplied by the generator.
Current limit: 70% of rated output current
12. The ammeter reading should be above the limit value. If the ammeter reading is below and the generator output wire is normal, remove the generator and check its condition.
13. Set the engine to idle mode.
14. Turn off the ignition.
15. Disconnect the tachometer or MUT-II instrument.
16. Disconnect the cable from the negative terminal of the battery.
17. Disconnect the dimmer and voltmeter.
18. Connect the generator output wire to the B terminal of the generator.
19. Connect the cable to the negative terminal of the battery.