GM Service Manual Online
For 1990-2009 cars only

The following components can cause generator noise:

    â€¢ A loose drive pulley
    â€¢ Loose mounting bolts
    â€¢ Worn or dirty bearings
    â€¢ A worn stator

Do not disassemble the generator. Separating the frames will damage the slip ring end bearing. Generator service is limited to replacement. Refer to Generator Replacement .