My dads lovely 2006 6.0 is acting up again, this time just a month after the warranty expired. The truck during the end of the summer would crank only after you cycled the key and would crank/fire on a second shot. It is now to the point where it wont crank at all in the mornings. We pull started it and it started fine and we drove it to a hill and shut it off. That try it started but the starter just made a grinding sound. We ran it all that day and it would crank fine in the afternoon after running around. Went to take it in this morning to the stealer-ship after already making an appointment and telling them just to replace the starter, the truck had to be bump started again. Got it into town and it cranked over fine for them. They then went to replace it (after not getting to it right away, then diagnosing it for 2 hours) they found out they didnt have a starter. I just want to make sure it is a starter issue for sure now. Its a no crank no start issue.