I have an older home that has a basement room containing a standard one-way on/off switch. Removing the switch shows just two wires. A black and a white. If I touch those two wires together the ceiling lights turn on.
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I added a ground wire to the box which connects to the circuit breaker box so now I have a grounded green wire along with the black and white.
When I install the Lutron Motion switch it doesn't work because it looks like the "hot" wire actually comes "after" the lights. In other words I think the hot from the breaker goes to one side of the light fixture then from the fixture to the switch.
The ceiling is finished (done by the previous owner) so I can't see how it's wired.
I'm out of luck aren't I....
Richard