Hello i have a 2005 F250 super duty with the 6.0. It started having a battery drain issue a few months ago. I have replaced the alternator, put 2 new Cat batterys in it. Still takes a notion and the battery's will be completely dead. Tried 2 more battery's and then truck was ok untill now and the battery's are dead again. It just takes a spell where it will do this. Hoping maybe someone has ran into this problem before. When it is all working correctly there is no drain on the battery's. Like i was saying it has worked fine the last 2 months and now it has drained them again. thanks for any help.