Hello guys

I have a late 04 f250 w the 6.0. When I try to start the truck w the key, it revs a bit then kicks the starter out. If i jump the starter wire to the battery it cranks fine. Ive swapped relays and it does the same thing. I took the relay out and jumped the switched wire to the starter wire coming out from the fuse panel under the dash and it cranks fine w the key. Something in the fuse box causing the problem? Anybody seen this before?

Thanks
Shem