@Dominic Last night I started my engine, attached a multimeter to the alternator, turned on some lights (to give it a load), then disconnected my battery. Adjusted the trim pot on the alternator voltage regulator till I got 14 volts. Seems to have worked! It's nice that they use nothing more than a rectifier and a cheap regulator for charging, instead of a more complex "smart" multi-stage charger.
@Sybil They're Sinopoly, which seems to have a good rep (watch the youtube video of them I posted earlier, it's my favorite!).