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I recently added a receptacle for hanging my TV on the wall. To do it I fished a wire through the wall and attached wires to an existing receptacle that's at a lower level on the same wall.

This is a wall that separated two rooms so there is another receptacle on the opposite end. All white wires and a black wire were joined together, and there was a wire between the two receptacles.

After I added the new wires, the ceiling light fixture in both rooms is not working anymore. I can confirm the bulbs are good, and I also tested it with a line tester and made sure current is reaching the fixture (in the bulb receptor), but no light.

Any other ideas on things I could check?

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You're going to have to provide either a better description of what you did, a wiring diagram, or both if you expect to get useful assistance. When you say "All white wires and a black wire were joined together". Do you mean you connected a bunch of white wires with a black wire, or you connected a bunch of white wires and then a black wire to something else. –  Tester101 Apr 9 '13 at 11:37
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Before your work on the receptacle did the switch that controlled the light also control the power to the lower receptacle? –  maple_shaft Apr 9 '13 at 11:38
    
no it didnt, also i checked the current at switch and it shows its getting there. –  np-hard Apr 9 '13 at 17:19
    
You probably actually were measuring voltage (volts), not current (amps). What kind of connectors did you employ? It's possible for a bad connection to deliver voltage, but not enough current to drive a light. –  bcworkz Apr 9 '13 at 21:16

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