Crank no start, 20A fuse keeps blowing in engine bay

Hello everyone, I was driving 2 days ago and it stalled, tried starting it again and no bueno. Tracked down a 20A fuse that was blown, it was inbetween a 60 and an 80A fuse on the positive terminal. I replaced it and it started, then when I got it in gear it stalled and the fuse blew again. Anyone know what that fuse is for? I believe its for the voltage regulator but I cant find anything solid on that. Anyone had this issue before? Thank you!

Maybe try replacing the fuse again and checking output voltage on the alternator to see what it's trying to push out.

Show us a picture of the fuses you are talking about. If you’re popping a fuse that big you have a short. Find it. It’s going to be on something that rubs and moves or gets hot.