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Check Charging System

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Ok I might be going insane or idk. My car keeps dieing after a few days of sitting. Thought it was my aftermarket sound system that kept draining the batter but no. Two time now the car has failed to start without the amp hooked up. Awhile ago I took it to Ford and they said battery and alternator are fine. I switched to the Red Top anyway. Ive never questioned this but now I will. I just put on longtubes and while loading the new tune, in the message display area it says check charging system and something about gas read error, but when im not loading a tune and do a system check my charging system says OK. This is really irritating me now. Went and got a voltmeter and when the car is running it never gets above 12.4 volts.
Thanks in advance.
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12.5 to 13.5 is where it needs to be ,, rev it up a little to see if it jumps up a bit . shouldnt go over 15 volts :bigthumbsup
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