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Do you have a cord reel on this?
Just checking back in to see if you perhaps missed by earlier reponse to your question? I asked about the cord reel as that often gives only one leg on the shore cord when it gets a bad contact where the power is transferred. If you don't have one, we can do some testing with a small digital multimeter and track down the problem. About $20 or so and easy to use. All follow ups are included in our fee.