Isuzu Repair: 1993 Isuzi Trooper, voltage drop test, amp fuse

Question
I replaced the main fuse on the engine bay fuse box...Cause the previous owner blew it after I had looked at it...He said it was having a problem charging the battery. So now it just blows the 80 amp fuse as soon as I hook up the battery any idea where I should start looking....Thanks in advance for any help....

Answer
Well Kelly you obviously have a short in your system somewhere. LIke bad or loose wires in your charging and starting system. I would have a voltage drop test and a fuse box wiring check as well for any black or hard/ corroded wires okay? If you have any other questions let me know okay?