Have a 2001 1500 4x4 5.2 and on the cover of the fuse panel it has the diagram and it is the 140 amp altenator, it is next the terminals on the fuse box its a little metal fuse held down by two screws, is it a dealer part?

 

you talking abot a big a$$ fuse in the fuse box beween the +,- cables and in bloted down?

if so you can pick them up at oreilys, thats were i got mine