Car: 91 dx hatch with B18A swap. MPFI is done.

Car ran great for about 5 days without any problems. I was driving and the motor just cut out. After getting it home and examining the problem, I realized that the ECU fuse was blown. I replaced it and once i turn the key, the fuses blows. I found out that something from the ECU plug A is causing it to blow. I finally found out that if I unplug the main relay and turn the key, the fuse does not blow.

Found out I had a bad ecu. Got a new one and the car ran for about half an hour. I popped the hood and the battery exploded and would not start. I am guessing Alternator problems now, but I am so frustrated and tired of all this crap.. Anyone have any ideas?