Generator Whine Concerns

INSPECT:
^ CHECK the ground terminal on the battery.
^ CHECK for coated mounting bolts on the generator bracket.
^ CHECK for a faulty mounting of the generator to the engine.
^ Make sure all ground straps between the engine and the frame are clean and tight.
^ Try the following fixes:
1. If noise is still present, check the charging system. Refer to Starting and Charging. Starting and Charging
2. If the charging system is functioning normally, check for technical service bulletins on generator whine.
3. Install a filter GM P/N 1224205 in the battery feed to the radio.
4. Try installing the filter with the following variations if noise is not eliminated
- INSTALL the filter with the single wire side toward the radio and the ground wire attached to a good ground.
- REMOVE the ground to the filter.
- REVERSE the filter so the two wire side is toward the radio with the ground wire attached to a good ground.
- REMOVE the ground from the filter.
5. If noise is still present, install another filter GM P/N 1224205 in the ignition feed to the radio. Install using the same variations as the first filter. If the installation of this filter causes turn ON or turn OFF delays or other noticeable performance concerns, REMOVE it and INSTALL a 0.47 mF capacitor to ground in its place.
6. REMOVE any unneeded filters after REPAIR, before reassembling the vehicle.
7. Refer to System Diagnosis.