[mr.precision]

Thank you for the detailed information.
The brown wire coming off the ignition switch was, indeed, disconnected. The odd thing is that it was connected to the two green wires at the base of the ignition switch plug. According the wiring diagram, that is for the temp idiot light. I don't have an idiot light for temp indicator.

I checked continuity for this brown wire at both ends, disconnected from the regulator. All good. I also installed a new ignition switch plug as the old one was in really bad shape.

Concern now is that the regulator connection for the brown resistance wire is showing a chassis ground. Not the wire itself....just the terminal at the regulator.

If that terminal is grounded, does this indicate the regulator is bad? Perhaps manually closing the points with this wire hooked up fried something in the regulator.
Pictures of the new ignition switch plug and wire connections. Note the only wire remaining is the brown wire and the accessory pigtail.