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I'm pretty sure the regulator uses pulse width modulation to work... under your logic, if the alternator ever saw ground it would go to max current to try to get back to 14 volts.
If the green wire is grounded, the regulator becomes ineffective and the alternator goes to maximum output which usually exceeds 15V. This is an all too common fault because the green wire usually runs along the valve cover where heat sometimes deteriorates the insulation and the wire goes to ground.
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If it sees 14 volts it would reduce ampacity. What happens if it sees nothing... I.e. the wire is disconnected?
If either field wire is disconnected there is no output from the alternator...the system reverts to battery voltage.
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