Hi,
14.1 to 14.3 volts is very high in the SUMMER. In winter, it is actually normal with a alternator that has temperature compensation. Your battery will heat up and boil out a lot of water (meaning you would need to refill it monthly with about 1 quart of water) if it ran 14.1 volts all the time. However in the winter, you would not go through nearly that much water, probably only 1 quart in 3 months. For driving, the battery is not overcharged for a long enough time to worry about, the battery water level will be fine.
It is OK to "Equalize" charge a battery for a couple of hours at 14.4 volts. It will break up any sulfur deposits on the battery plates, and is recommended for home based battery systems that run on solar panels and a inverter to equalize charge once a month.
Fred.
