I had to take down a ceiling light to remove an old wire while renovating.
I eventually managed to wire everything up correctly, but I'm still puzzled by how I miswired it the first few times. I know I got the pairs of wires mixed up, but I still can't picture any circuit that would do what is described below.
3 pairs of wire come into the box - one set of black and white is the power coming in, one pair goes to the switch for the light, the other continues to the outlet on the wall. The light had a CFL bulb in it, and the outlet had an LED night light plugged in.
Once I restored power:
- With the switch up (can't say for certain if this was on or off), the ceiling light was on, but the night light didn't.
- With the switch down, the ceiling light was off, and the night light was on dimly
- When flicking the switch, the nightlight would get brighter or dimmer for a second
- With the bulb in the ceiling removed, the nightlight wouldn't work at all.
At no point did the circuit breaker trip. Also, the entire circuit has no ground connection.
What kind of messed up wiring would make it do that? I've since figured out the correct wiring, but it still bugs me.
Edit: The closest I can come up with is that maybe I wired the light and outlet in series (incoming black to outlet black, outlet white to light black, light black to incoming white) with the switch between the black and white of the outlet. I think that might do it...