Dual field alternators require regulators with 2 field wires.
Unless you put one field to ground on the alternator, in which case you can use old style regulator, But you still have a single field alternator.
I wish you guys would stop calling these "dual field". They are ISOLATED field meaning "not grounded"
The current path for grounded field (up through 69) is battery neg..........ground path...........grounded brush.........through the field........to the VR field terminal..........and back to battery
The current path for isolated field is from battery NEG.........to VR ground.........through the green wire to one field terminal...........through the field..........and through the blue wire back to battery
They both work pretty much exactly the same. The VR modulates current through the field magnet to control output
