Since they found a loose ground wire, tightened it up and it did the same thing I'm thinking the loose ground wire had nothing to do with the problem. The service tech probably found it, the car worked afterwards so they assumed it was the problem.

Most lemon laws require the same repair to be made more than twice to be enforced. So if he's eventually looking at 3 or 4 trips for this problem then I don't have a problem with him evoking it, especially with a problem that leaves him stranded and could potentially be dangerous.