1990 Other Dodge Models alternator

The only thing that controls it is internal regulator on the alternator. On the 3way connection on the generator here is a black wire if you follow it back there is a fusible link on it. It may be making contact then not as it may be connected by one or two strands. It will be a smaller wire connected to a larger one or a fuse. Do not confuse the black ground wire with this one as there is a black ground wire as well or should be that contacts the alternator. Also check yoru connections on the alternator as a wire that has only a couple of strand connection will do this as well.