Ballast Wiring Instructions


The ballast in a fluorescent light fixture is the device that produces the electrical current that is needed to cause the light to illuminate. Over time, the ballast can begin to malfunction or cease to work completely. Flickering of the lights, humming or buzzing, and delayed starting of the light can be signs that the ballast is going bad. When replacing the ballast it is important to wire the new ballast correctly. A incorrectly wired ballast will not operate properly and could pose a risk of fire or personal injury.

Things You'll Need

  • Screwdriver
  • Wire strippers
  • Wire nuts
  • Disconnect the power from the light before opening the cover. Turn off the switch or flip the circuit breaker that controls the light's circuit at the main breaker box.

  • Remove the bulbs and place them to the side. If you are also replacing the bulbs, dispose of the old bulbs in accordance with local regulations. Florescent bulbs contain mercury, so take care when disposing of them.

  • Remove the metal panel that runs down the length of the light. Slide the panel edge from underneath the metal tabs that hold it in place. If the panel is secured with screws, remove these and place them to the side.

  • Cut the wires that are coming from the ballast. Try to cut the wires as close to the ballast as possible to ensure that you have adequate room to wire the new ballast in place.

  • Remove the ballast from the light fixture. Use a screwdriver or adjustable wrench depending on the type of screws that are used to secure the ballast.

  • Install the new ballast and secure it to the light fixture using the screws that you removed in the previous step. Be sure to tighten the screws securely.

  • Use wire strippers to remove ½ inch of insulation from the wires coming from the light fixture. Remove the insulation from the wires that are connected to the new ballast as well.

  • Match the wires from the new ballast to the wires from the light fixture. The wires are color-coded and should be connected to each other accordingly. If the wires on the light fixture are different colors than those on the new ballast, refer to the wiring diagram printed on the ballast for the correct connections.

  • Twist the bare wires together and secure the connection using electrical wire nuts. Tighten the wire nuts securely. Ensure that the connection is secure. Gently but firmly pull on the wires to ensure that they can not easily slip out of the wire nuts.

  • Replace the metal panel onto the light fixture and replace the bulbs. Reconnect the power to the light and turn the light on to ensure that it is working properly.

Related Searches


  • Photo Credit light image by Jan Will from
Promoted By Zergnet


You May Also Like

  • How to Rewire an Electric Ballast From a Magnetic Ballast

    In fluorescent lighting fixtures, electronic ballasts offer several benefits in comparison to magnetic ballasts. Electronic ballasts use new and more efficient technology,...

  • How to Wire a T12 Ballast

    Ballasts are electrical devices that control the flow of voltage to fluorescent light fixtures. Over time, ballasts can wear out or malfunction...

  • How to Wire a 3 Lamp Ballast

    One of the great advantages of using fluorescent lighting in your basement or garage is that it produces plenty of bright light...

  • How to Install A New Electronic Ballast

    A ballast is a device that triggers a florescent light to light up. They are commonly used for the long tube florescent...

  • How to Wire a T8 Ballast

    Fluorescent lighting is ideal for a variety of applications and locations, including the garage, basements and other areas where bright, white light...

  • How to Wire an Advance T5 Ballast

    Every do-it-yourselfer has an area that he just does not feel comfortable in. For some people, it is plumbing; for others, it...

  • How to Wire Ballasts

    Fluorescent lights, as well as some other high-powered lights, are fitted with a ballast. The ballast controls the flow of electricity to...

Related Searches

Check It Out

22 DIY Ways to Update Your Home on a Small Budget

Is DIY in your DNA? Become part of our maker community.
Submit Your Work!