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Causes of Lost Power After Changing a Light Fixture


By Dave Rongey - Summary:

Common Problems with Light Fixture Wiring and How to Repair Them: Inspecting the Light Fixture Wiring, Reinstalling the Light Fixture, Resetting a Tripped Circuit Breaker.

How to Repair Lost Power to a Light Circuit

Electrical Questions about Light Circuit Problems:

  1. My neighbor was replacing a light fixture in my basement laundry room, when all of a sudden something popped.
    • He said he accidentally crossed a wire.
    • Well after that some of my wall outlets and ceiling light fixtures upstairs stopped working.
    • Unfortunately I can not afford an electrician.
    • What can I do to get my house electrical straightened out?
      • This electrical question came from: Brian, a Homeowner from Rochester, New York.

     

  2. I replaced a ballast in a bathroom fixture over at my neighbors home yesterday.
    • The switch was off so I wasn’t too concerned about capping off the exposed wire (they wouldn’t fit through the back of the fixture with a wire nut on the end of it) so I just left them off.
    • I noticed that as I threaded the wiring back through the fixture that a light in the adjoining bedroom went out.
    • I lost power to the bedroom and the bath.
    • The GFI didn’t trip and neither did the panel box. I can’t find anything tripped.
    • The switch that feeds the bathroom fixture is an LED toggle style.
    • In addition, there is a ceiling fan and light switch in the bedroom that are the same.
    • Non of them will toggle anymore.
    • What have I done to my neighbors home? Any suggestions?
      • This electrical wiring question came from Carol, in Jacksonville, Florida.

Dave’s Reply:
Thanks for your electrical wiring questions Brian and Carol.
Both of these problems of lost power when working on light fixture electrical wiring can be repaired by reviewing the following possible causes.

Common Problems with Light Fixture Wiring and How to Repair Them

There is a good possibility that the problem is either a tripped circuit breaker, or a problem in the light fixture wiring. If the light is not working there may be a loose wire that did not make connection, or was left out of a wire connection all together.

Guide to Resetting a Circuit Breaker

More about Troubleshooting Electrical Wiring
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2 Responses to “Causes of Lost Power After Changing a Light Fixture”
  1. Dave Rongey says:

    Hi Rick,
    The voltage should be checked at the primary side of the light switch, and any associated wire splices of both the line and the neutral.
    Be Safe,
    Dave

  2. Rick says:

    I recently changed the light in my bathroom. All working well for several weeks. Suddenly last night the lights go out, no pops or fuses blowing or tripping or anything dramatic. I checked the connections in both the fixture and the switch and both are fine but still no light.

    Checked voltage in light and was 0V.

    Nothing has changed it simply switched off and won’t come back on. The hall light is on the same switch and is working fine.

    Any ideas?

    Cheers,

    Rick