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Old 12-29-2012, 12:53 PM
GMR GMR is offline
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shop light ballast wires reversed

Help please - new electronic ballast for T12 twin bulb flourescent light has wires reversed on one side. Where the black wire and white wire are supposed to be, instead, the 2 yellow wires are. Where the 2 yellow wires are supposed to be, the black wire and white wire are there.

Do I connect the 2 yellow wires to the power and neutral, treating them as if they were black and white, and connect the black and white wires to the lamps? Or, do I connect the 2 yellow wires to the lamps and the black and white to power and neutral.

Just noticed something else - on the old ballast the white is on top of the black and on the new, mixed up one, the black is on top of the white.

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Last edited by GMR; 12-29-2012 at 01:09 PM.
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Old 12-29-2012, 01:25 PM
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Post a pic of the diagram on the ballast. DO NOT hook up feed white and black to the yellows.
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Old 12-29-2012, 01:28 PM
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took it apart, figured it out, thanks anyway
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Old 12-29-2012, 01:33 PM
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Pugsy, didn't see your post - I took the old one apart, some black "stuff" broke, looks like carbon, anyway, I just peeked at the new one without breaking anything and can see the yellows are wired the same as the old so I'm going to assume the black and white are wired ok too. Can't see them, that's were the breakage occurred. Old one was made in Mexico, new one in China.

Thanks.
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