i need to hook up an external mechanical voltage regulator on my ranger/scout mud truck and the wiring is missing from the cab swap so i need to know where the wires go, hopefully you guys can help...its has 4 pins that go f-2-3-4 and the #4 pin has 2 spade terminals on it. any help would be goodn thanks josh

 

This should get you going. I thought the terminals were labeled with the letters? Your regulator may have an "I" terminal. In this configuration, you don't use it.

 

well the regulator is for a 72 scout and i thought you need the 2 field wires, switched power and a ground, i guess im a little confused with the diagram you showed me

 

All alternators have one Field wire and when power is applied to this wire the alternator will charge, take the power away and it will not.

The "A" wire always goes to the battery.
The "F" wire always goes to the Alternator "F".

The "S" wire may go from the regulator to the alternator and it would go on the "S" screw. In this case the "I" wire from the Ignition switch would go to the "I" screw and this set up would be for a light on the dash system.

If you have a gauge then the "S" is not used or goes to a choke heater and the "I" wire goes to the "S" screw. The "I" screw is not used.