Q: 2002 chrysler t & c alternator good but does not charge battery also behind dash buzzing sound

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2002 chrysler T & C a few days ago started to have problem in charging system battery light came on. Checked alternator (good) & battery (good). Charged up battery. Drove T & C battery light came on battery loosing charge. Car still working and battery keeps going down. Today started a buzzing sound behind the dash and is not coming from motor area. I have gotten P 0455 on codes from vehical internal test. Also my charge indicator says alternator bad but off vehical test says good. What do you think.

My car has 157000 miles.
My car has an automatic transmission.

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