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Terrible alternator whine


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So my 89 coupe has always had a bit of an alternator whine that comes over the speaker cables.  It's never been terrible but recently whenever the car warms up and goes into closed loop the whine shifts from low and barely noticeable to a loud

 buzzing that almost drowns out any music that I'm trying to play.   I've tried cleaning the ground cables around the battery and checking the ground cable for the antenna but to no avail.  Do you guys have any ideas?

Edited by Spazzaroth (see edit history)
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