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Have my outside Xmas lights plugged into a gfi. It's been working for weeks but now is tripping, I've reset it but as soon as I plug them in it trips again.any troubleshooting I can do? Thanks
 

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Have my outside Xmas lights plugged into a gfi. It's been working for weeks but now is tripping, I've reset it but as soon as I plug them in it trips again.any troubleshooting I can do? Thanks
Begin removing the light strings until you find the bad one.
 

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Sounds like your Ground Fault Circuit Interrupter (GFCI) is doing its job of keeping you safe. They measure the current going out and back from what you plug-in. If the two are different, they trip because the electricity is going where it shouldn't - i.e. you have a ground fault, which is not surprising since your light strings are near ground.

I suggest you begin by tossing the oldest strings.
 
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