Thanks for all of the help guys. None of it was the problem. Get this:
After trying everything suggested and some things that weren't it was taken to a Chevy dealership with a savvy technician. He said that the factory installed radio/disk deck installations had a quirk that could develop in them that would drain the battery. The radio/disk decks were disconnected and the problem was SOLVED.
Suggested either go without the noisemaker of buy an after market unit.