That is often true with digital volt meters. However, to do the test just described, the ignition switch will have to be "on" for the regulator to sense something. This is where an analog meter works or a test light.
Could disconnect both F1 and F2 wires. Probe those wires with a test light. The light should burn brightly. Seems a lot of people don't use test lights, anymore. Maybe I should have asked if the OP has one?
