Where is the voltage regulator located? on 1990 Plymouth Voyager

My battery kept draining, so we figured my alternator went out. However when we finally managed to get it pulled and tested, they said it was fine. that was when they suggested it may be the voltage regulator, which is apparently not part of the alternator on this model of vehicle, but we can't find it. Does anyone know where it may be located?

Asked by for the 1990 Plymouth Voyager
I suggest you have this diagnosed to see if the alternator is charging or you may have a drain on the battery. Is the battery draining while driving or when parked?
1 more answer
It is in the alternator. Does the voltage gauge show a (-) while you are driving?