[Roxo]

I suspect a bad connection somewhere. He got it running a second time. If the fuse blew or the ammeter failed would it start up again?
I would check my connections from the Battery on out. A sudden surge could have blown the fuse the second time the car died, so I would use my multimeter to check it.
I deal with this often with old jukeboxes and radio's, work one minute but not the next. Take your time and check all connections and grounds. Don't forget the ignition switch and ammeter connections.
Good luck