3.3 V6, replaced alternator with new one, charge light still comes on sometimes. on 1997 Chrysler Town & Country

The charge light comes on normally after travelling for more than twenty miles. The check engine light flash pattern was 12 46 55. After restarting the car, the light would normally stay off for rest of the day. Voltage of battery was 12.4 when car not running and 14.0 when car is running.

Asked by for the 1997 Chrysler Town & Country