96 D1 with 75k on it


Recently, when the car is idling or moving, the alternator is making a humming sound, not unlike a large bee under the hood. It changes pitch with changing throttle position.

Any thoughts?

 

bad bearings in the alternator .... slightly loose belt ...

 

Is the radio off - sometimes alternator noise will come through the radio, especially in AM mode.

 

happens with the radio on and off

the alt. is about 1500 miles old

 

If it (the alternator) is still within warranty I would recommend bringing it back to the supplier and getting a new one. Sounds like a bad bearing.