I have a 2004 f250 5.4L superduty. I keep blowing the 10amp alternator fuse under that dash and not sure why. Faulty battery? I'm just about certain it blows the fuse upon starting of the vehicle. Its happened twice in the last couple days and both times were shortly after initially firing up the truck.
I've been up and down the alternator and battery harness. Not use where to go from here.

 

Whats is the fuse number for a 2006 250 5.4

 

That info should be in your owner's manual.