Generator Whine Concerns
WARNING: This page does not describe the selected car, but rather 6 other vehicles, including the 2004 Oldsmobile Bravada, 2004 GMC Envoy XUV, 2004 GMC Envoy XL, 2004 GMC Envoy, and 2004 Chevrolet TrailBlazer. However, it is still accessible from the selected car via links, so may be relevant.
- Inspect the ground terminal and cable for high resistance.
- Inspect the generator and brackets for loose or coated mounting bolts.
- Inspect that the ground straps between the engine and the frame are clean and tight.
- If the noise is still present, inspect the charging system for proper operation. Refer to Diagnostic Starting Point - Engine Electrical in Engine Electrical.
- Install a filter GM P/N 1224205 in the battery voltage feed circuit to the radio.
- If the noise is not eliminated, install the filter in each following variation:
- Install the filter with the single wire side toward the radio and the ground wire attached to chassis ground.
- Remove the ground to the filter.
- Reverse the filter so the 2-wire side is toward the radio with the ground wire attached to chassis ground.
- Remove the ground from the filter.
- If the filter GM P/N 1224205 causes a delay when turning the radio ON or OFF, or other problems, remove the filter and install a 0.47 micro farad capacitor to chassis ground.
- Before reassembling the vehicle, remove any unneeded filters.
- Test the functionality all of the vehicle systems including those not related to the audio system, for proper operation and function.