2003 Volkswagen Jetta "Hot" alternator hot wire

My `03 Jetta 1st blew the fuse that is for the alternator, after replacing the bad fuse I noticed that the hot wire from the alt. To the battery was extremley hot, the rest of the positive wires that are fed out of the same fuse block are all handleable, I have already tested the atlernator and its charging fine at between 13 and 14 volts. I also took the same wire in question out of the vehicle to check for any areas where the sheeting may have been worn off but the wire is fine, I have traced the other wires in that same block looking for a grounded wire but was unsucessful in finding a grounded wire, why is that alternator wire getting so hot?