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Two different size ultraviolet ballast. The .71AMP ballast feeds two 40W ultraviolet ''UV'' bulbs. The .37AMP ballast feeds one 40W ultraviloet bulb. The two light to larger bal;last want come on. The light on the smaller ballast just blinks. How do I troubleshoot to see why all three bulbs are not burning? Or is there a way to test a ballast?

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I usually test the ballast simply by excluding everything else.

1) Put in bulb that you know works
2) Replace starter (if you have one)
3) check that wiring is intact (sounds like it is for you but I had one light that the wiring barely made contact so sometimes it came on and sometimes it blinked)
4) If all that is good, then it's probably the ballast.

Posted on Sep 30, 2009

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