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This happened to me a couple of times and I originally thought it was a microswitch. It was very intermittent. When I did some more analysis on my boxster I found that when previously working on it that I failed to tighten down the positive lead to my battery. (Kind of stupid, but I'm only human). Evidently at some times it was making strong contact and other times it wasn't. Little things can drive you crazy. Good Luck
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