74 dart sport won't charge

Here is a simplified diagram:

Dual_Field_Alternator_Wiring.jpg

Dont let this all scare you. Here's what you have:

The switched 12V ignition goes to one field terminal, and to the VR "I" (ignition) terminal. The VR case is grounded

On the diagram, 12V is going to the upper (blue) field terminal, and the center "I" terminal.

The green goes from the VR "F" terminal over to the remaining alternator field terminal.

WHAT HAPPENS is that the VR gets power, and this power IS the VR "sense" voltage. It controls "the amount of ground" on the field of the alternator.

So to make the alternator charge "full output" you unhook that green, and ground that field. This causes FULL field current to flow through the field, giving it maximum magnetism.