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My car had a high pitched wine for a while too. It was my alternator.
Turned out it was causing some strange electrical happenings in my car. My clock on my stereo was running really fast, and every once in a while when I would depress the brake, my spedometer would go up. Really weird but all better now. Being lazy I didn't swap out my alternator right away and I had a good spare one in my garage too!. So one night driving home from boston just as I enter the tunnel, my battery light flickers a few times. Thank goodnes it hung in there til I got home. I took it out and You could see some of the wires in the coil burnt out. Car is a 92 with 48,000 miles. It only had 9,000 when I bought it 3 years ago and the alternator had been changed already. Those GM ones are not that great. I have had 4 of the same car and have always had to replace the GM alternator in it. I always go a shop in my town that is a specialty alternator/starter shop. Once you upgrade (only like 85.00) to one of theirs it is good for 100,000 +.
Eric
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