GM Service Manual Online
For 1990-2009 cars only

Disassembly Procedure

Notice: Do not pry against the stator or the slip ring end frame during generator disassembly. Damage to the generator may result.


    Object Number: 35340  Size: SH
  1. Make scribe marks on the following components in order to ease in assembly:
  2. • The slip ring end frame
    • The drive end frame

    Object Number: 35721  Size: SH
  3. Remove the 4 through bolts.
  4. Notice: On models with a slip ring end ball bearing on the rotor shaft, this bearing must be replaced with a new bearing any time the two halves of the generator are separated, if not replaced, the bearing may bind and fall due to distortion of its outer tolerance rings. This does not apply to roller-type slip ring end frame bearings.

  5. Separate the slip ring end frame and the drive end frame.

  6. Object Number: 35722  Size: SH
  7. Remove the nuts holding the stator to the heat sink.
  8. Remove the stator from the slip ring end frame.
  9. Unsolder the following connections to the voltage regulator:
  10. • The connector strap
    • The brush holder

    Object Number: 19575  Size: SH
  11. Remove the brush holder insulator screw.
  12. Remove the voltage regulator screw.
  13. Remove the following components from the slip ring end frame:
  14. • The voltage regulator
    • The brush holder with the dust shield

    Object Number: 17211  Size: SH
  15. Remove the following components from the brush holder:
  16. • The brushes
    • The dust shield
  17. Clean the brushes with a dry soft cloth.

  18. Object Number: 19576  Size: SH
  19. Remove the rectifier bridge and the capacitor as a unit:
  20. • Remove the bolts.
    • Remove the washers.
    • Disconnect the leads.
    • Remove the bridge and capacitor assembly.

    Object Number: 21380  Size: SH
  21. Remove the slip ring end frame bearing.

  22. Object Number: 17332  Size: SH
  23. Remove the following from the drive end frame:
  24. • The nut
    • The washer
    • The pulley
    • The fan collar
    • The fan
    • The outside collar
    • The rotor
  25. Remove the inside collar from the rotor.

Inspection Procedure

  1. Refer to the Generator Component Test for Generator Diagnosis.
  2. Inspect the drive end bearing. If the bearing is rough or worn, replace the generator drive end frame assembly.
  3. Inspect the slip ring end bearing. If the bearing is rough or worn, replace with a new bearing.

  4. Object Number: 17203  Size: SH
  5. Inspect the rotor for grounds (1), opens (2), or shorts (2).

  6. Object Number: 17205  Size: SH
  7. Inspect the stator for grounds.

  8. Object Number: 17207  Size: SH
  9. Inspect the rectifier bridge for continuity.