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Yes, 1980 and on is switched ground, so your 12v on the regulator's green wire does nothing for you.
Should read battery voltage on the brown wire to the field coil from the wiring harness, same on the brown to the regulator.
Because it's semiconductor based there is no specific value of anything to measure on the green wire from the regulator.
If you could measure resistance to ground with the regulator plugged in and ignition on you might get a varying value, likely going up as battery voltage increases.
If you really wanted to use the regulator you could switch the brown wire going to the field coil for a wire to ground.
It does add the slight chance that IF the field coil shorted to ground that you'd fry the regulator.
Switched ground avoids that and you'd only blow a fuse.
Worst case scenario though.