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John,
I'm not much of a believer in the moon controlling the behavior of my vehicles, but if that helps you, fine!
Lead-acid batteries can develop intermittent internal shorts that are dependent on the internal temperature of the battery. And, an internal short is just about the only way a battery can read 7 Volts one time and 12 Volts a few minutes later, since you gave no indication it was charged in between!!!
I suggest a visit to K-Mart or Wal-Mart for a new battery! And, just for the record, I find that automotive batteries are much less reliable these days, than they were 30 years ago! Pressures of the competitive market mean shortcuts to reduce cost of manufacturing, and hence, reliability suffers ... but you won't get any admissions from the industry, they are too wrapped up in advertising hype!
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Warren Hall
1973 911S Targa
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