70 amp fuse blowing

now i had a bit of a stack and was repairing it all today, i dove it home after the accident but when i tryed to start it again nothign happened, the typical symptoms of a killed alt feed wire, 70 amp keeps blowing and the only wire that runs off that b4 any other lesser fuses is the alt wire, so im goign to chek this 2morrow, just wondering on all your opinions on what to look for and what to do

yeah you could have a bad ground....download the manual to check all the grounds....i had a bad ground that was blowing my 15 amp fuse and then i tired a 20 and it blew it...so i checked the grounds and one was bad.