A quick run through.. built engine and relocated battery to the rear (main positive to starter, starter to fuse box.. Accessories post runs to the alternator.. ground is ran to the engine). I just bought a new alternator because the last one wasn't charging the battery. I had it tested at 3 different auto parts stores to be sure. I ended up buying the driveworks alternator from Advance Auto Parts. I went out and was driving the car kinda hard before I sell it to make sure everything is working, and not having any issues. I drove it for about 30 minutes, stopped at a stop sign and the car died. I had to push start it to get it running, didn't drive it hard for another 10 minutes home and it was fine. I went to Advance and the alternator was only putting out 12.4V, I had it bench-tested and it was putting out 13.5V. The battery is good, alternator is good.. Any ideas? Do I need to upgrade the #3g wire from the battery to the alternator? or is this not even my problem?