Before you start, check:
- installation of the generator and connection of wires;
- the battery is fully charged;
- alternator drive belt tension;
- fusible link;
- absence of abnormal noise from the generator.
Turn the ignition key to the "OFF" position.
Disconnect the cable from the negative battery terminal.
Connect a digital voltmeter to the generator's "S" terminal and ground. Connect the voltmeter's "plus" to the generator's "S" terminal, and the "minus" to a suitable ground (to the body) or to the negative terminal of the battery.
Disconnect the standard wire from the generator terminal "B".
Connect an ammeter (DC, 0-100 A range) in series between the generator terminal "B" and the disconnected standard wire. Connect the "minus" of the ammeter to the disconnected standard wire, "plus" to the generator terminal "B"
Connect a reference tachometer according to the manufacturer's instructions.
Connect the cable to the negative terminal of the battery. Make sure that the voltmeter shows battery voltage.
Note: If the voltmeter shows 0 V, then either there is an open circuit between the generator "S" terminal and the positive terminal of the battery, or the fuse has burned out.
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 nominal values of the regulated voltage given in table 7.7, then the voltage regulator is working properly. If the voltmeter readings do not correspond to the range of nominal values, then either the voltage regulator or the generator is faulty.