How to Replace a Light Ballast

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Tired of the humming and flickering of your fluorescent light? You may need to change the ballast. The light ballast controls the flow of energy through the light bulb. A ballast that is faulty or has a short may cause the light bulb to hum or flicker. Check the model of your fluorescent ballast by checking the number at the end of the ballast to order a new part and to ensure the replacement part does not cost more than a new light.

Things You'll Need

  • Socket wrench
  • Wire cutters
  • Wire nut
  • Unplug the fluorescent fixture or shut off the power to the socket at the fuse box.

  • Remove the ballast cover using a socket wrench to remove the nut attachment or by unclipping the cover. That exposes the wiring underneath.

  • Cut the old ballast wiring several inches away from the ballast using sharp wire cutters.

  • Unscrew the ballast using a socket wrench to remove the mounting nut. Hold the ballast while your unscrewing it to keep it from dropping.

  • Place the new ballast in place of the old unit. Have someone hold the light in place.

  • Twist the wires of the new ballast to the old wires leading to the light. Cover the connected wire with a wire nut to protect the connection. Restore power and test the light.

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References

  • Photo Credit fluorescent light starter image by Edsweb from Fotolia.com
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