I had to change out my alternator red cable with in-line 100 amp fuse. What I thought was odd was that the alternator black cable also had an in-line 100 amp fuse, and both connected to the starter. The black cable had Y split and was hard wired into the starter itself. I am thinking the black cable only acted as a ground, but why a 100 amp fuse? And same for red, alternators usually put out only 20 volts so why so high a fuse? Anyone else had to do this? Any ideas. Once replaced it runs fine. Had to replace the battery and alternator itself which probably blew the fuse.