Actually guys, I now believe the problem to be the alternator. I had it tested on the truck before, and it wasn't putting out anything. I found out that was because the lower mounts had sheared off, so I got it remounted, but before doing so, I took it to Advance Auto and had them bench test it off the truck. It worked fine. Put it back on the truck, but never had it actually tested on the truck until yesterday. After thinking everything through, the problem seems to occur after I've driven the truck with the lights on (i.e. at night). Drove it home one night, drove fine. Next morning, it wouldn't start. Roll started it and drove it to work. Sat there for 8 hours. Started fine. Drove from work with the lights on to subway for dinner. Came out and it wouldn't start. Roll started it and drove it home, but it acted REALLY weird (lights barely lit, tach jumping up and down, radio flickering in and out). That was from driving it twice in a row with the lights on and not having a driving session with no lights on in between. The alternator is putting out just enough to keep the battery charged when the lights aren't on, but with the lights on, it can't do both, so the battery drains down some, enough to where it won't start the next time. I remember reading back some time ago that you could put a 105 amp alternator on a track/kick. Anyone got a link to the info on that by chance?