Voltage Regulator Testing?

KitCarlson said

Yes. If you have a variable power supply here is a simple way to bench test. Place a 12V bulb test wires on field terminal of regulator and case ground. Place the + supply lead to ignition terminal of regulator, - to case ground. Start at 12V, the bulb should light, increase voltage to 14.5V, the bulb should go out. By slowly changing the voltage you can determine the operate point.

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I don't have a variable power supply. This may be a stupid question, but could I instead hook a lead from my truck battery to the top ign terminal with the truck not running and test it, then start the truck and test it again since it will then be about 14.2V?

At what voltage should the VR not turn the test light on.

Lastly, I assume I touch the light to the field terminal on the VR? Is that correct?