alternator test good. Is it the starter? Will a car jump start with a bad starter? This problem occurs randomly every few months. Once, my friend tapped the alternator body with a wrench and it started but I've tried this many times with no luck. Its driving me nuts because the last two times I had to get a jump I drove it straight to the garage and told the mechanic my problem. When he checked the battery and alternator everything was fine. I turned the car off and presto it started right up. He didn't believe there was a problem at all. Is there a short? Will a starter somehow revive itself?
Sounds like a short to me, not the starter. I would double check the connections at the alternator, since a little love tap fixed it once.