Alternator Full fielding..??

10-4 I understand, only reason I swapped regulators was to see if any one would show a major difference to the others. The reason for voltage checks was to see if there were any drops big enough to create a charge voltage that high. When I say close 12.8 compared to 12.7 or 12.6 on the other components. Still not sure why there would be ANY voltage at the green wire..
Because there is some small amount of resistance to the current flowing between the point you are measuring and ground.