i parked my car and went to work this morning, but i left the lights on and i come back to find a completely discharged battery

i get someone to jump me, and after 30 minutes of charging it, it cranks and goes.

i turn the idle up to 1400 rpms, and let it sit for a while, then go to the bank.
against my better judgment, i turn the car off and go inside.
when i come out, not only wont the car start, but i get NOTHING.
no lights inside, no clicks, nothing.

a guy gives me a jump but still no lights or anything.

turns out after some frantic calls that my fusible link is bad.
problem is, i dont have a fusible link.
the wire has been ghetto rigged (by the previous owner) so that its just a straight wire with a few connections for things like the fan relay and other stuff in between.

i try getting jumper cables from the positive of another battery to the post on my alternator, and sparks fly and it cranks, but its a no go.
my thinking is that i somehow managed to **** up a literally brand new optima red top, blow a few wires, and seriously ruin my day, all at once.
can anyone think how to fix this?
im a wiring noob.




oh, its parked near lynnhaven mall if anyone is local and wants to lend a helping hand.
ill pay cash on the spot for any help.