Generator Whine Concerns

1. Test the ground terminal and cable for high resistance.
2. Inspect the generator and brackets for loose or coated mounting bolts.
3. Verify that the ground straps between the engine and the frame are clean and tight.
4. If the noise is still present, inspect the charging system for proper operation.
5. Install a filter, GM P/N 1224205, in the battery voltage feed circuit to the radio.
6. If the noise is not eliminated, install the filter in the following variations:
^ Install the filter with the single wire side toward the radio and the ground wire attached to a chassis 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 chassis ground.
^ Remove the ground from the filter.
7. Install a filter, GM P/N 1224205, in the ignition voltage feed to the radio.
8. If the noise is not eliminated, install the filter in the following variations:
^ Install the filter with the single wire side toward the radio and the ground wire attached to a chassis 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 chassis ground.
^ Remove the ground from the filter.
9. If the filter causes delays when turning the radio on or off (or any other problems), remove the filter and install a 0.47 mF capacitor to a chassis ground.
10. Before reassembling the vehicle, remove any unneeded filters.
11. Inspect all of the vehicle systems (including those not related to the audio system) for proper operation and function.