Help! 2 wire Alt convertion question?

if you use the newer style alt. with a newer (dual field) regulator then you need to use the other field wire to the regulator. if you use the newer alt. with the old style (single field) regulator then you ground the other field wire. if you look at the old style alternator meant for a single field setup then you can see the negative side is grounded to the case internally. this is why you can use the dual field alt. with a single field regulator but not a single field alt. with a dual field regulator.