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What kind of buzzing sound are you hearing? And where is it coming from?
Was the car on while you checked it today?
Ok. The battery should be at about 12.65 volts when it is fully charged. If you had 13.7 volts while it was on then you most likely don't have a charging issue. I have never seen a charging issue with these vehicles, but 12 volt batteries seem to be a big issue due to the large parasitic draw that these have.
Ok. Please let me know how it goes.