Charging system troubleshooting

I disconnected the wire and stabbed the probe into the connector.

I reinstalled the alternator and just for S&G's I disconnected the VR connector and inserted two machine screws into the connector and jumpered between the two. Engine at 2000 rpm is putting out 11.9V at the alt stud. Down approx 0.17 V since yesterday.
Not sure what you thought that does.

Sometimes its helpful to look at the earlier system because its wiring is simpler.
When voltage drops, electricity is permitted to flow through directly the regulator.
When voltage starts to get too high, no electricity flows through.
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When electic current is allowed through the regulator it goes to the positive field terminal, then through the carbon brush that rubs against the spinning copper ring. Electricity flowing through the rotor windings creates a spinning electro-magentic field.

Two field terminals on the later alternators allow the later regulators to control the ground. In other words they open and close the connection to ground allowing or stopping the flow of electricity that creates the spinning magnetic field.

Some people call the two field terminal versions, isolated field terminals. This means both are insulated from ground. This is a better way to understand it.

This is a rough schematic of the regulator.
Important thing is the regulator uses the system voltage measured at the feed wire (blue) to allow power through the rotor.
If you jumpered the two wires together, then you created a short circuit to ground.
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