Pic. 19.4. Connecting wires and devices to the generator when checking the output current of the 4G9 engine generator
Pic. 19.5. Connecting wires and devices to the generator when checking the output current of the 4G1 engine generator
This test allows you to determine whether the output current of the generator corresponds to the rated value.
1. Check the following items before testing:
- generator status;
- battery condition;
- alternator drive belt tension;
- burnable fusible link;
- no abnormal noise from the generator when the engine is running.
Note. The battery must be partially discharged. With a fully charged battery, the test cannot be performed due to insufficient generator load.
2. Turn off the ignition.
3. Disconnect a wire from the negative plug of the storage battery.
4. Disconnect the wire from terminal B of the generator. Connect a 0-100A DC ammeter in series between terminal B and the wire disconnected from the generator. Make sure that the ammeter negative probe is connected to the wire disconnected from the generator.
Warning. To connect wires and devices, do not use clamps, but tighten the connections with bolts and nuts. Otherwise, an unreliable connection may cause an accident.
5. Connect a voltmeter with a measurement range of 0-20 V to the terminal B of the generator and «mass». Make sure the positive voltmeter lead is connected to the generator's B terminal.
6. Connect a wire to the negative plug of the storage battery.
7. Connect a tachometer or MUT-II.
8. Leave the hood open.
9. Make sure the voltmeter shows voltage at the battery terminals. If the voltmeter shows a voltage of 0 V, then the fuse has blown or the electrical circuit connecting the generator terminal B and the positive terminal of the battery is open.
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 given off by the generator.
Current limit: 70% of rated output current
12. The ammeter reading must be above the limit value. If the ammeter reading is low and the alternator output wire is normal, remove the alternator and check its condition.
13. Move the engine to idle.
14. Turn off the ignition.
15. Disconnect the tachometer or MUT-II.
16. Disconnect a wire from the negative plug of the storage battery.
17. Disconnect the dmmeter and voltmeter.
18. Connect the generator output wire to the generator terminal B.
19. Connect a wire to the negative plug of the storage battery.