[masraum]

I have an old house, '67, with Al wiring. We've got Al rated outlets and switches. Tonight the light in a room went out. I thought it was the breaker, but the breaker is not tripped (I turned it off and on and it isn't tripped). I have an unused breaker, so I tried swapping the breakers. Still no go.

If I put a multimeter across the white and black wires with the switch off I get a reading of 78V. When I turn the switch on it goes to .07V. If I take a reading (switch off) across the white and ground I get 120V, and if I take a reading across the black and ground I get 25V. With the switch ON I get 120V from neutral to either white or black.

I have no idea what any of that should read except that with the switch on I should get ~120 across the white and black.

If I wire a bulb across white-neutral or black neutral I get light, but across white-black, nothing.

To me that says that I'm getting power, but am I getting it in the right place? How in the hell can I tell.