Generator Whine Concerns

^ 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.
^ Ensure that all of the ground straps between the engine and the frame are clean and tight.
^ Try the following fixes:
1. If the noise persists, check the charging system.
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. If installing the filter does not eliminate the noise, try installing the filter using the following variations:
- 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 that 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 the noise is still present, install another filter GM PIN 1224205 in the ignition feed to the radio. Install this filter using the same variations as the described for the first filter in the previous step.
6. If the installation of the second filter causes turn On or turn OFF delays or other noticeable performance concerns, remove it. Install a 0.47mF capacitor to ground in the filter's place.
7. Remove any unneeded filters after the repairs are complete before reassembling the vehicle.
8. Refer to System Diagnosis.