Upfitter?

[KurtA]

So I found the location of fuse F55, supposedly a 25 amp power source for aftermarket accessories. If I put a fuse in the slot, where is the wire that's fed by it?

 

[Jordan2929]

That could just be something for the next gen heavy duty models if they plan on using the same fusebox. If not I'd be interested in knowing where it goes as well.