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rsa rsa is offline
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Join Date: Mar 2001
Location: Texas
Posts: 100
I had the same problem, 77 911S, it seemed to only happen at low rpm's. I blamed it on low output from alternator. It was worse when other electrical draw on the system ie wipers, radio.
I purchased a yellow top optima deep cycle battery. Fixed!
Old 10-23-2002, 12:45 PM
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