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I've got a similar issue with my '86 944. I install a new battery and she runs fine, with perhaps a slight but noticeable deterioration in starter cranking time, for about 90 days. Then, one morning, nothing. Not even a click when I turn the key. I remove the battery, and find it open. Complete failure. I replace the battery and that resets the issue - in 90 days, I'll be doing it again, perhaps a little sooner if I don't drive her every day. The fuel gauge and speedo are intermittently erratic as well, but I'm not sure that's a related problem. The power windows are slow, but they work, as does everything else electrical right up until the 90-day battery failure. She's dead in the driveway right now, and I'm tired of changing batteries. Any ideas?
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