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I took out an old fixture in my kitchen ceiling to replace with a new one I found. The old fixture worked, but after I took it off and re-insulated the wires (I used heat shrink tubing because the insulation was crumbling off) there was no longer any current. Everything else on the breaker works, and I checked the switch directly before it with my multimeter and it seems to work. I tested the wires feeding into it and one of them reads as having a broken connection. I don't know what it could be other than a broken connection somewhere in the ceiling but that doesn't make sense.

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If the insulation is crumbling off wires in a ceiling box, you have a very dangerous condition. Time to call in a pro. –  bib Aug 10 '13 at 17:35
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