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You actually got a fault? Or, when the DIC went through key on the battery voltage showed 13.8 . That level is actually pretty good for a car that had been sitting.
13.8 is the mean (average ) votage regulator setting. + - 0.7
when there is a problem with your charging system a "Charging system fault " is displayed.
there is nothing wrong with a 13.8 voltage reading..