elementwc3

I have a 97 civic with an h22a swap with not many miles on the swap yet. battery relocated to trunk. the issue im having is every time I crank the car over the main 80A battery fuse blows. I thought I had a loss connection on the main battery wire so tightened it and it seemed to help for about a day and now it blows again. ive already re wired the ground as it was a little corroded, ive unhooked the alternator thinking maybe bad voltage regulator and that didn't change anything. could this be the starter possibly? all of my wires are clean and nothing is grounding out that I could see.