finger tightened only. About 25 miles into the trip, the car started to shake badly, which instantly jarred my memory. I pulled onto the shoulder and tightened them all down.
Another time I connected the jumper cables to the opposite terminals on my z31. Never in a million years did I think I would make such an obvious mistake and I always thought anyone who did that had to be an idiot. I didn't figure out what was wrong until the burnt smell. By then I melted a few fuses and blew out a bunch of tiny bulbs behind the dash. So for my troubles I got to take the dash apart.