Hello, I've read some of the great advice on this site that makes my mechanic seem like a complete amateur. I have an charcoal gray 03 F-250 SD crew cab 6.0L with black interior with carbon fiber inserts. I love this truck! I bought it with 38k miles on it & have put on about 100k since owning it. It has rarely had an issues which seems rare with early 6.0Ls. The first year or two that I owned it I almost never had to plug it in to start it in winter ( I live in wisconsin). Lately if its below 15 degrees over night it either wont start (unless on the plug) or I have to cycle the plugs a couple times before it roughly & loudly starts. Yesterday I ran the battery dead trying to start it. Any ideas what could be the issue? Thanx for this site!