Grant,
Welcome to the forum.
The selector switch points to the "primary" bottle. By primary I mean the one you intend to draw from. If that primary bottle goes empty then it automatically switches over and pulls from the secondary (other) bottle and the green indicator goes RED. If that secondary bottle is not turned on then no propane.
Before you disconnect the empty bottle remember to turn the "switch to the new primary bottle - the full one). If you don't you will have a propane leak out the hose when you disconnect the empty bottle. Voice of experience.
[s]I believe the center position is off for both bottles but not sure on that.[/s] Per below Center does nothing.
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