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ill bet its just a bad battery. keep it simple. charging a bad battery wont fix it. i would also recommend maybe a higher authority than auto zone to diag. for you.
Put it on my new C7 battery tender overnite. First thing in the morning
she's perfect. I immediately go to my battery authority (Sears) thinking battery or alternator.....they say both check out strong. Driving all around today and everything OK.
I think I know the problem. I got my C7 a month ago and the C6 became the garage queen while up for sale. Battery was probably borderline charge when I used it a couple times. With the full charge, I think I'm back in business.