You want to power Vreg only in the Run position (IGN1), not in Start (i.e. cranking, IGN2). No sense having the alternator fight the starter while cranking. The key switch only applies power to IGN1 or IGN2 at a time. As I recall, the blue wire to the triangle connector is from IGN1 (key switch). It should also go to one alternator field terminal. The green wire from the Vreg triangle connector goes to the other field terminal. Doesn't matter which field terminal, but you can find photos here if you want to be factory correct. If custom wiring (like it did) it is probably easier to install Vreg near the alternator.
