single field to dual isolated field alt

Well I asked you about alternator rotor current draw and you completely ignored the question.

So if you cannot check the BASICS I guess WE can't help you

If you want to settle down, PAY ATTENTION, and actually answer specific questions some of us asked you, then we might be able to do something, here

I would do THREE things

1 CHECK rotor current draw!!!!!

2 "Rig" a temporary wire from battery to regulator IGN terminal to check charging voltage

3 Change your supplier of regulators. Consider buying a quality one instead. The NAPA VR-1001 is expensive but works, AND you could use it on the later alternator by simply grounding one field terminal