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The battery should be at 12.4 to 12.6 volts... If you hit the key, and the battery goes below 9 volts, I think you've found the issue. I would also want to know if there is a parasitic draw that is killing the battery. Have you had the battery checked? It sounds like a dead battery issue. Check out this link http://www.autoshop101.com/forms/h6.pdf