Chevrolet Repair Questions? Ask a Mechanic for Answers ASAP
I am an electrical specialist, and I will try to help. Reading the battery voltage wont tell you much when you have a drain discharging your battery. It will tell you if your battery is dead, or charged. You need a different approach to check for power draining. You need to disconnect one of the battery cables and set your voltmeter to amps. Then attach one terminal of the voltmeter to the disconnected battery post, and the other voltmeter terminal to the disconnected battery cable. Once you hook this setup up like this, you are reading amps, which is consumption of battery power. That is key in tracking this problem. What I would do is to set up the meter, make sure the battery is fully charged then pull fuses one at a time to see if one will stop the drain. Suspect items are things like under hood lights, and glove box lights not turning off. I would pull the accessory fuse first. Also look at any device that has been added on. GPS, radios, or any other non stock electrical accessory. Check out the link HERE to further clarify the meter hook up to check for current draw. If you have any other questions feel free to ask.
Were you able to figure this out, let me know if you need any more help. Good luck with it, have a great day, and thanks for using Just Answer.