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Everyone was correct. Went to a different autoparts store, by the time the guy got out to the truck the voltage had dropped down to 10 volts and he said he couldn't test it. I went ahead and bought a new battery and threw it in there, cranked right up and has been going strong since. Problem solved! Thanks guys!

Thanks, since I'm out of the bumper to bumper warranty - I'm going to take it to another autoparts store and have it tested again - I'll also ask what the CCA is. I'll report back, if you're correct - which I hope you are - I'll mark it as answered! thanks!

I have a 2014 SIlverado LTZ Z71 5.3L that I have had for over a year with no issues. Yesterday I drove to work, parked it for about 10 hours, then got back in it and it would not start. It did the "clicking" noise when cranking, meaning the voltage on the battery was too low. I got a jump and drove home, dash gauge showing a little over 14 volts the whole way home - so alternator was working the entire time. I went to an autoparts store to have the battery tested in the vehicle. They said the battery was GOOD and just needed to be charged. I put a slow charger on it over night. This morning I checked the battery voltage and it was only 11 volts. The vehicle cranked slowly, but started. I shut it off and then after about 20 minutes I checked the battery voltage again - this time it was at 10.5 volts. I put a multimeter in series between the negative battery terminal and the negative battery cable. There was a 2.5 amp draw. I started unplugging fuses from the engine fuse block, but nothing lowered the amperage. Then all of a sudden (after about 5 minutes) the amperage slowly dropped down to 0.40 amps and stayed there. One time it dropped down to 0.0 amps random -- I didn't even do anything to cause this. It's very confusing. I noticed when I hit the "lock" or "unlock" button, the amperage draw jumps up to 6.5 amps (all of this is done with the dome light set to OFF) Also, the radio would keep turning on and off whenever I open the door. There would be a faint popping noise coming from the speakers when the screen would turn off/on - this was when the voltage of the battery was at 11 volts. Anyone know what could be the issue?