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I just bought a house, had it inspected and everything but when I get Possesion I find the lights don't turn on in the spare room. I then find they do turn on but the master bedroom must be on at the same time.

Currently there is a black and red wire running to the switch in the MB with two white wires tied together seperately.

The spare room has one white and one black to the switch and that is all

Hopefully this is an easy fix as this is not something you want when you first move into a place..

Thanks a lot

  • Whether it is or isn't an easy fix will depend on exactly how the building was wired. We can't answer that from here; soneone needs to trace the wiring on sute. Hire an electrician. (This is why some suggest that your budget for a house should always include up to $10k or so to take care of immediately needed repairs and renovations. It's much less painful if you simply accept that something weird will be needed in the first year.) – keshlam Jan 30 '16 at 5:16
  • Can you post photos of the inside of the switch box in the master bedroom? – ThreePhaseEel Jan 30 '16 at 17:47
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I fully agree that you need an electrician, but I wanted to place a guess on what may have happened, just for fun.

The problem was most likely made in the ceiling box in the MB. Someone obviously tied the switch in the MB to the switch in the spare room; so when you flip both switches on, the current is travelling through two switches then up to the spare room light.

I'm guessing that the culprit is the black wire- it is travelling from the switch in the MB, to the light in the MB, and to the switch in the spare room. And (another guess) there is probably a cable connected to both ceiling boxes... the travelling black goes through the ceiling box in the MB to the ceiling box in the spare room and then down to the spare room switch. Then the white wire from the spare room switch will carry the power up to the light and I'd bet the end of it is wrapped with black electrical tape.

In the ceiling box of the spare room there are (guessing) two white wires connected to the fixture (one is probably wrapped with black electrical tape) and two black wires tied together (separate).

Now back in the MB, the power (the true hot) is connected to the red wire in the ceiling which goes down to the switch. When the MB switch is on, power flows through the switch, up the black wire to the ceiling box where the black wire is tied to both the light fixture and to the switch in the spare room.

And I'm guessing that the solution (in the ceiling box of the MB) is to connect the red wire to the light in the MB; and connect the black wire to the true hot, so that both switches have a hot wire.

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