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I understand your underway but the best thing to do is remove it and have it tested. I would inspect all the terminals and connections for loose or corrosion issues. Glad you have good batteries those voltages are perfect.

Great advice thx!
Was in a bit of a hurry to get here and help a family member who has now past.
I will get in there in inspect wiring and grounds. 
I see a local rebuilder to maybe test it ( Turbo and Electric in Phoenix) if it comes to that.
If I can find a source for the regulator I was thinking I would try anyways since existing is 40 years old and probably not adjustable.
Jeff