Before starting work, check:
- installation of the generator and connection of wires;
- the battery is fully charged;
- alternator drive belt tension;
- fusible insert;
- no abnormal noise from the generator.
Turn the ignition key to position «OFF».
Disconnect the cable from the negative battery terminal.
Connect a digital voltmeter to the terminal «S» generator and «mass». Connect «plus» voltmeter to output «S» generator, «minus» to a suitable «mass» (to the body) or to the negative battery terminal.
Disconnect the standard wire from the output «IN» generator.
Connect ammeter (DC, with a range of 0-100 A) in series between output «IN» generator and disconnected regular wire. Connect «minus» ammeter to the disconnected standard wire, «plus» to the conclusion «IN» generator
Connect a control tachometer according to the manufacturer's instructions.
Connect the wire to the negative battery terminal. Make sure the voltmeter shows battery voltage.
Note. If the voltmeter shows 0 V, then either an open circuit has occurred between the output «S» alternator and the positive battery terminal, or the fuse has blown.
Turn off all lights and additional electrical equipment.
Start the engine.
Set the engine speed to 2500 min–1.
Read the voltmeter reading when the generator output current is 10 A or less.
If the voltmeter readings correspond to the regulated voltage ratings given in table 7.7, then the voltage regulator is OK. If the voltmeter readings do not correspond to the range of nominal values, then either the voltage regulator or the generator is faulty.