Disconnect the generator connector.
Start the engine and set the speed to 5000 rpm.
Measure the AC voltage between the generator power wires using a multi-tester. If the voltage is not within the specified value, replace the generator with a new one.
09900-25008: multitester
Tester Pen Installation: AC Voltage Measurement
Voltage on the generator windings without load: not less than 75 V at 5000 rpm (with a cold engine)