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There is no "on" or "off", the alternator always tries to put out more than battery voltage. The blue wire will always have battery voltage when the key is in the RUN position.

What we refer to as a 12V system is actually a 14V system (I'll probably get some disagreement here) but all of the components in a 12V system are built to handle 14V+.



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 it sees 14 volts it would reduce ampacity. What happens if it sees nothing... I.e. the wire is disconnected?

'73 Charger Petty Blue, Black Vinyl, and Gill Slits 727 torque-flight 400 BB Chrysler 8 3/4 rear