Generator Whine Concerns

^ 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.
^ Ensure that all of the ground straps between the engine and the frame are clean and tight.
^ Select from the following list of repair procedures:
1. If the noise still exists, inspect the charging system.
2. If the charging system functions normally, examine the 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 not eliminated, install a filter with the following variations:
4.1. Install the filter with the single wire side toward the radio and the ground wire attached to a good ground.
4.2. Remove the ground to the filter.
4.3. Reverse the filter so the 2-wire side is toward the radio with the ground wire attached to a good ground.
4.4. Remove the ground from the filter.
5. If the noise still exists, install another filter GM P/N 1224205 in the ignition feed to the radio.
6. Install this second filter using the same variations as the first filter.
If the installation of this filter causes ON/OFF delays or other noticeable performance concerns, remove the filter and install a 0.47-mF capacitor to ground.
7. Remove any unneeded filters before reassembling the vehicle.
8. Refer to System Check.