Not much help. Down here in Portland.
But I doubt you melted everything. Fuses would have blown. What isn't fused, is the ground. Chances are you back fed positive to ground. Probably smoked that wire and anything wrapped with it.
The fuse block has a bunch ground to the left of the fuse panel. Theres another behind the temp control.
In my 911, the ashtray light wire grounded out and melted back to fuse panel once.
Good Luck .............. I'll check back in about 6 hours and see if you got some help.
While I'm previewing I see Jon has contacted you ...................... Your in good hands.
Headed out to burn metal .....................
Click to view attachment