New 4 bulb ballast - only 2 positions work at a time

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Old 03-02-16, 07:37 AM
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New 4 bulb ballast - only 2 positions work at a time

Hi Guys,


I am a homeowner with DIY experience and had luck replacing a 4 bulb fluorescent with 2 ballasts with one 4 bulb ballast. When I repeated the same procedure with the second identical fixture and identical ballast only two out of the 4 positions will burn at a time.
What’s strange is that it can be any two positions - just not all 4 together.
I checked and rechecked my wiring it all looks correct and identical to the first fixture that working.

Any suggestions?


Cheers!
Sam
 
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Old 03-02-16, 08:32 AM
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Make sure you don't have a bad lamp. Other than that, I would suspect you got a bad ballast.
 
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Old 03-02-16, 08:48 AM
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I checked and rechecked my wiring it all looks correct and identical to the first fixture that working.
Just to eliminate a possibility be sure your wiring matches the actual diagram on the ballast. There could be differences in wire color between the two fixtures. You should never use the previous wiring as a guide. You should always use the diagram on the new ballast and remember colors may vary so you need to connect by location shown on diagram not colors.
 
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Old 03-02-16, 11:04 AM
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I checked the wiring and the diagram they are identical as they both ballasts are identical as well.
 
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Old 03-02-16, 11:12 AM
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Then that only leaves a defective ballast.

A partially defective electronic ballast is pretty rare. I've found that an electronic ballast either works or it's dead.

You said your wiring is correct. Did you actually check right back to the tube sockets ?
 
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Old 03-02-16, 02:05 PM
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Update:

Its not the ballast. I switched the ballasts (one that was working in non working fixture and had the same problem, one that wasn't working is fine in the other fixture).

PJmax - What should I be looking for behind the tube sockets?

Thanks!
Sam
 
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Old 03-02-16, 02:19 PM
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You need to check the connection of wires at tombstones and or check the lamps by switching lamps around.
 
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Old 03-02-16, 05:42 PM
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Solved

Thanks pattenp!

I unscrewed the tombstones and saw that two wires were crossed.

Thanks everyone for your help.


Sam
 
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Old 03-02-16, 06:14 PM
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With your old ballast it probably wasn't critical. It was with an electronic ballast.

Thanks for letting us know how you made out.
 
 

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