Some great help guys, thank you.
Tiny in your post, once I get the new battery in and disconnect the POS cable, should the truck be running. Or is it done with the engine off?
Engine off. That way your charging system doesn't come into play. I said positive cable but either should work. If you have a parasitic draw it may not be much so a multi-meter is what I would use if I were doing the test. It'll give you a much more accurate reading than a standard auto ammeter. Unless you have a sterio or some such gadget that has a parasitic draw built into it you should show no current flowing at all with the key off. If you show a draw start pulling fuses until the draw goes away. That'll show you the circuit the draw is coming from. Good luck.
