Before performing this test, please check the following.
- Generator mounts
- Battery.
Caution! The battery must be slightly discharged. It is difficult to provide the required electrical load with a fully charged battery.
- Drive belt tension
- Fuse link
- The presence of extraneous noises coming from the generator when the engine is running
Turn the ignition key to the "LOCK" position.
Disconnect the negative cable from the battery.
Warning! Do not use alligator clips to connect to the electrical circuit. Use the threaded connectors provided. Otherwise, any loosening of the clips may cause negative consequences due to the high current flowing through the circuit.
Connect a 0-120A DC clip-on ammeter to the wire between the alternator "B" terminal and the battery.
Attention! Connecting a conventional ammeter to a break in the circuit is possible if the electrical contact between the generator terminal "B" and the current wire is not broken.
Connect a voltmeter with a 0-20 V measurement range between the generator terminal "B" and the vehicle ground (Connect the positive lead of the voltmeter to the terminal "B" and the negative lead to the ground).
Connect the negative cable to the battery.
Connect a tachometer or MUT-II/III diagnostic tool.
During the test, the car hood must be open.
The voltmeter should show the battery voltage.
Attention! If the voltmeter shows a voltage of 0 V, the probable cause of this may be a break in the current wire or fuse link between the generator terminal "B" and the positive terminal of the battery.
Turn on the headlights and start the engine.
Immediately after turning on the high beam headlights and the maximum speed of the heating system fan, increase the engine speed to 2500 min⁻¹ and take the maximum reading of the ammeter.
Maximum permissible value: not less than 70% of the nominal value
Attention! The nominal value of the generator output current is given in the section "Generator set characteristics".
Since the battery charging current decreases quickly after the engine is started, the test should be carried out as quickly as possible to determine the maximum output current of the generator.
The value of the generator output current depends on the electrical load included and the generator temperature.
If the test fails to create a sufficient electrical load, the maximum value of the measured generator output current may be lower than the specified 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 the lighting devices of another car as a load.
If the temperature of the generator itself or the ambient air is high enough, the generator output current may also be less than the set value. In this case, cool the generator and repeat the test.
The generator output current value must be higher than the maximum permissible 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 the "LOCK" position.
The material was borrowed from the website (MitsubishiMan)
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.