squareback alternator wiring in pre 70 car issue

Sedanman said

I did the ground of the VR to the ground on the battery and I get 0.10 - 0.13V. I also did a test from the + on battery to the blue wire/ign on my VR and get 12.20V without the alternator field grounded which is the same I get by testing the battery alone at idle.

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you would need to ground the 2nd alt field terminal to get current flowing to get a voltage drop number between batt + post and reg blue wire (ign) terminal you are testing. have it at a fast idle & run it for just a short minute just long enough to take a reading (assuming your overall charging rate is still in the 15's).