Hello Peter, Welcome to the forum. Sorry to hear of the trouble, but it is possible. If you just bought the part, and installed it, I would hope that it would be replaced. No.1 Are you sure that the wires never crossed? my first thought is that it would cause problems. No 2 Are you sure that the power is going into the switch, and not coming out of the other end? I have seen wires that broke under the insulation and could not be seen. It is possible that a new switch gets out of production and has a problem. Those are where i would start. I hope that you can find a cause. And good luck. There will be much more talented people along with other ideas. in the meantime, enjoy the forum!
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