Hey Guys, I have a 2003 6.0L F-250. In May of 2008 the alternator went out and left me stranded, I replaced it roadside and was problem free for a year. In June of this year I once again had the alternator go out. Replaced it again. 3 weeks ago the alternator went out again and I replaced it. After replacing it this time I was able to drive for 2 days before the batteries died. Now the batteries have to be charged every night with an external charger. I have had the alternator tested and tried another alternator. Nothing seems to charge the batteries. I took it to 2 Ford dealers and they say everything tests fine. I tore the truck apart and spent 7 hours tracing back all the electrical wires in the cab and engine compartment to make sure nothing was grounding out. Everything was ok. I then heard about the "fusible links" and had no idea how to test those. I wiggled them around and now my truck runs really rough! I have no idea where to go from here so I am hoping someone has an idea. Let me know if you need any more info.