Could be the brushes are worn on the alternator field coil. Also might be that the suppressor that is mounted externally on many alternators has failed. Check this and any ground straps FIRST before doing the more expensive repairs. You can also disconnect the alternator wires to see if the whine goes away to verify that it IS the alternator. Ground straps at the alternator and radio to frame ground are very important in keeping the radio signal clean.
- Vote on answer
- posted
18 years ago