System Charging Too High

Hello all, really quick before I head to work, I thought I'd share a problem the Duster is giving us right now. First of all, yes, she's running now. Lol, more on that later. But the problem at hand is that the charging system is charging too high. It can get as high as 18 to 19 volts at times. Makes the battery boil. The alternator is brand new, and has tested good at the auto parts store tester. The voltage regulator and ballast resistor are new as well. Any ideas where to start diagnosing? Thanks!