OK, I thought this look like another post.
I have an FL70, soon to grow up.... but anywho when my alternator failed, it went to 12 volts on the gage. When I got a new one, it was at 13 volts for some reason until I cleaned all the cables. Then it popped up to 13.5 to 14.1 depending on a lot of things. It should sit above 13 volts on the meter and not go over much over 14 but I would recommend getting a digital meter and checking it at the battery.
I have a digital gauge that sits on the dash, it monitors the accessory leg of the system, that lags behind the batteries by .7 of a volt.