keep blowing primary battery fuse 20amp
Okay, near the passenger side of truck 97 f1504x4 there is a primary battery fuse that connects between wire on alt and primary fuse block, this fuse blows soon as I install one in the vehicle running or not, has anyone ran into this problem could it be a bad alt? I traced all possible wires and none seem to be grounding out any place and all grounds seem to be making a good ground connection, the truck has a new battery and starter installed prox three months ago, the truck does run and start but with out this fuse in place it will not charge and it runs on battery til it is dead then stops running completely, I traced batery wires, alt wires, starter wires etc, and all lights inside and out seem to be working fine, radio etc all working fine, as well as all power options. do you think maybe something inside the alt is messing it up? thanks for any tips or advice ahead of time!