Generator Inspection

Check the rotor for an open circuit.

1. Measure the resistance between the slip rings.
   

   Standard resistance:

   1.85 to 2.25 Ω at 20°C (68°F)
   

   If the result is not as specified, replace the rotor assembly.
   

Check if the rotor is grounded.

1. Measure the resistance between the slip ring and rotor.
   

   Standard resistance:

   10 kΩ or higher
   

   If the result is not as specified, replace the rotor assembly.
   

Check that the slip rings are not rough or scored.
If rough or scored, replace the rotor assembly.

Using a vernier caliper, measure the slip ring diameter.

Standard diameter:

14.2 to 14.4 mm (0.559 to 0.567 in.)

Minimum diameter:

14.0 mm (0.551 in.)

Using a vernier caliper, measure the exposed brush length.

Standard exposed length:

10.5 mm (0.413 in.)

Minimum exposed length:

4.5 mm (0.177 in.)

Check that the bearing is not rough or worn.
If necessary, replace the bearing.

Check that the bearing is not rough or worn.
If necessary, replace the generator rotor assembly.

When rotating the pulley, check that it turns clockwise and that it does not turn counterclockwise.
If the result is not as specified, replace the generator pulley with clutch.