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fluorescent ballast replace question

Discussion in 'Troubleshooting and Repair' started by paulmars, Aug 30, 2016.

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  1. paulmars

    paulmars

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    Aug 30, 2016
    needed to jiggle bulb to get it to fully light up. cleaned and tightened the electronic contacts and that did not help. bought new bulbs and they worked fine for 2 months. now we jiggle again. How can I be sure its the ballast?

    tks,
    pa
     
  2. Minder

    Minder

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    626
    Apr 24, 2015
    If this is a standard fluorescent fixture and not and older style with a start switch or a mag lamp etc with electronics, there is not much else apart from the ballast and a bad contact on the lamp pins.
    More info on the fixture needed.
    M.
     
  3. paulmars

    paulmars

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    Aug 30, 2016
    bought new 20 years ago. does that help?
     
  4. Tha fios agaibh

    Tha fios agaibh

    2,097
    707
    Aug 11, 2014
    Because you've covered the only other possibilities.

    Often a failing ballast will not produce enough current to light the lamps.
    As the lamps age, they draw more current.
    That's why it worked good for a few months.

    Best to just replace both ballast and lamps.
     
  5. paulmars

    paulmars

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    0
    Aug 30, 2016
    with one of these spare ballasts?:

    Philips Advance REB-4P32-SC

    Magnetek 413-c-tc-p413ctcpdiyi 043168897099

    or used: FULHAM PONY npy-120-226-cfl

    pa
     
  6. Bluejets

    Bluejets

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    Oct 5, 2014
    Economically, it's better to get the whole fitting replaced. 20years is a pretty good run.
     
    davenn likes this.
  7. duke37

    duke37

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    Jan 9, 2011
    I have never known an inductive ballast fail. They often go noisy with an annoying buzz.
    The reason the tube will not light could be an old tube but these will often flicker before they fail completely or could be the starter which has to withstand a large voltage to start the discharge.
    Wiggling to start it will do the job of the starter if the connections are not perfect. Try a new starter.
     
  8. Minder

    Minder

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    626
    Apr 24, 2015
    I have replaced a few, that is why Home Depot (N.A.) stock them as parts!
    M.
     
  9. Bluejets

    Bluejets

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    859
    Oct 5, 2014
    Balasts do fail and will either go open circuit or short out, the latter causing tube elements to blow clean out.
    Depending on tube size, balast resistance should be somewhere around 40R.
     
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