Electrical Trouble

My original only had two wires two the alt. So I should disconnect the field terminal to the chasis of the altenator Green wire?

yes and trace to see where the wire that is suppost to come from the voltage regulator is it should be a blue wire if I remember correctly, your voltage regulator is a square box about 2"x2" on the drivers side firewall. it should have two wires, one positive when the key is on and the field wire running to the alternator it also must have GOOD ground