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Phone tester indicates that phone jack has reverse polarity how do i fix it?

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If you have 2 wires in the phone jack, it shouldn't be a problem to keep working like it is. If you have 4 wires you'll need to change the polarity of each pair until you don't have the polarity reversed any more.

One pair is connected to 3 and 4 the second pair is 2 and 5 or 1 and 6. 

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