Generator Whine Concerns

Complete the following inspections:
^ Inspect the ground terminal on the battery.
^ Inspect for coated mounting bolts on the generator bracket.
^ Inspect for a faulty mounting of the generator to the engine.
^ Verify that all of the ground straps between the engine and the frame are clean and tight.

Complete the following repairs as needed:
1. If the noise is still present, inspect the charging system.
2. If the charging system is functioning normally, refer to any technical service bulletins on generator whine.
3. Install a filter GM P/N 1224205 in the battery feed to the radio.
4. If the noise is still present, install the filter with the following variations:
^ Install the filter with the single wire side toward the radio. Attach the ground wire to a good ground. Remove the ground to the filter.
^ Reverse the filter so that the two wire side is toward the radio and the ground wire is attached to a good ground. Remove the ground from the filter.
5. If the noise is still present, install another filter GM P/N 1224205 in the ignition feed to the radio. Install the filter using the same variations as in the first filter.
If the installation of this filter causes turn on or turn off delays or other performance concerns, complete the following steps:
5.1. Remove the filter.
5.2. Install a 0.47 mF capacitor to ground in the filter's place.
6. Remove any unneeded filters after the repair before you reassemble the vehicle.