Magneto battery charger

[Conaway2]

A buddy of mine has a 1914 T and wants to buy or build a battery charger that will take the magneto output and produce a regulated 12-14 volt output. Does anyone have any suggestions for something like this ? We’re specifically interested in having a regulated output so the charger doesn’t boil the water out of the battery, like the small chargers with a lightbulb in the circuit do.