OP, in your original post you did not mention that you double checked the new battery from autozone. Before I would do anything else I would take it back to get load tested or at least put a volt meter on it and see what it says. Don't assume that "new part" is ALWAYS good. Being in automotive business for some time now, I have seen many guys and myself included get burned. The battery could easily be dead or have a bad cell which will cause all sorts off electrical issues. They could've had it sitting on the shelf for some time without trickle charger hooked up. Absolutely eliminate the basics before going deeper. My 02 cents.
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