I know I don't have an F-150, but I do have a 2008 Ford Ranger and my door lock fuse blew over the weekend. I just got around to getting to AutoZone to purchase 15A and 20A fuses to replace it just incase the 15A blew relatively quickly. Mind you I've already replaced it once a couple months ago because my auto-door locks quit working.

But, I popped in the 15A, tested it it worked! Then I used my remote and nothing. The horn and alarm work just fine. So the 15A blew within a matter of 20seconds. So I thought I'd put a 20A in. It blew as soon as I plugged it in. I'm going to head to the dealer tomorrow since its rush hour and they won't have ample time to do a full diagnostic. So I'll go in tomorrow right after work. Thankfully it's still under warranty. And A BIG Thank you to Swamper for posting your work order information. I'll be surely to print it off and take it with me to speed up the process.