Check the following before performing this test.
- Alternator mounts
- Rechargeable battery.
Attention! The battery should be slightly discharged. With a fully charged battery, it is difficult to provide the necessary electrical load.
- Drive belt tension
- Fusible link
- The presence of extraneous noise coming from the generator when the engine is running
Turn the ignition key to position «LOCK» («TURNED OFF»).
Disconnect the negative cable from the battery.
Attention! For connection to the electrical circuit, do not use clips-clothes type «crocodile». To do this, use the existing screw connectors. Otherwise, the possible weakening of the clothespin connectors can lead to negative consequences due to the large value of the current flowing through the circuit.
Connect a hanging DC ammeter with a measuring range of 0-120 A to the wire between the terminal «IN» generator and battery.
Attention! Connecting a conventional ammeter to a break in the circuit is possible if the electrical contact between the output is not broken «IN» generator and current wire.
Connect a voltmeter with a measurement range of 0-20 V between the terminal «IN» generator and «weight» car (Connect the positive lead of the voltmeter to the terminal «IN», and the negative wire to «mass»).
Connect the negative cable to the battery.
Connect a tachometer or MUT-II/III diagnostic tool.
During the test, the hood of the car must be open.
The voltmeter should indicate battery voltage.
Attention! If the voltmeter shows a voltage of 0 V, then the probable cause of this may be a break in the current wire or a fusible link between the output «IN» alternator and positive battery terminal.
Turn on the headlights and start the engine.
Immediately after switching on the high beam headlights and the maximum fan speed of the heating system, increase the engine speed to 2500 min-1 and take the maximum reading of the ammeter.
Maximum allowable value: not less than 70% of the nominal value
Attention! The rated output current of the generator is given in paragraph «Characteristics of the generator set».
Since the battery charging current decreases rapidly after starting the engine, the test should be carried out as quickly as possible to determine the maximum current output of the generator.
The value of the generator output current depends on the included electrical load and the temperature of the generator.
If during the test it was not possible to create a sufficient electrical load, then the maximum value of the measured recoil current of the generator may be lower than the given value even with a fully functional generator. In this case, try to discharge the battery a little by turning on the headlights for a while (with the engine stopped), or use another vehicle's lights as a load.
If the temperature of the generator itself or the ambient air is high enough, then the generator output current may also be less than the set value. In this case, cool the generator and repeat the test.
The value of the generator output current must be higher than the maximum allowable value. If the generator output current is less than the maximum permissible value, and the generator current wire is in good condition, then the generator must be removed and disassembled to determine the cause of the malfunction.
After checking, release the accelerator pedal.
Turn the ignition key to position «LOCK» («TURNED OFF»).
Disconnect the tachometer or MUT-II/III diagnostic tool.
Disconnect the negative cable from the battery.
Disconnect the ammeter and voltmeter.
Connect the negative cable to the battery.