2001 Honda Civic LX Electrical Problem

On my way home from work the battery light started flashing. . . intermittently and so fast I wasn’t sure what it was. A little later lights out and a tow.
Looked under the hood 80A main fuse blown and the negative spade connector on starter was loose. Took the starter to Azone and it checked out okay. Put everything back and connected a new fuse. Then when reconnecting the negative battery cable after the positive big spark and blown 80A fuse. I guess I still have a short somewhere. Guesses/Experience?