Spazzaroth Posted February 2, 2021 Share Posted February 2, 2021 (edited) 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 February 2, 2021 by Spazzaroth (see edit history) Link to comment Share on other sites More sharing options...
rogold99 Posted February 2, 2021 Share Posted February 2, 2021 I would try some new spark plug wires and spark plugs. Link to comment Share on other sites More sharing options...
Jim Posted February 2, 2021 Share Posted February 2, 2021 Another easy way to eliminate the alternator is take the belt off and start the engine and see if you still have the noise. Link to comment Share on other sites More sharing options...
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