Mark, I discovered, by accident, that a GFCI will also trip if the ground wire comes in contact with the neutral wire. Try it, jump a wire from ground and put in the neutral side. Perhaps you can explain why there is a small potential difference between ground and neutral.
I've made water sensing devices that trips a GFCI, turning the power off to a 110v water pump. The water sensor has a small switch that I've wired to short ground to neutral. It works, turns power off to well. It has saved me from having a flooded basement many times. Got 2 wells wired up that way.
I would recommend running the ground wire to the GFCI and see what happens. George
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Today's Featured Article - Fasteners: The Nuts and Bolts of Nuts and Bolts - by Curtis Von Fange. The nuts and bolts of nuts and bolts is an interesting and essential piece of knowledge that applies to our older tractors. An improperly torqued capscrew on an engine head or a shear bolt that is too hard on the driving shaft of a bushog can create havoc and make an expensive and uncalled for repair. Let�s examine the purpose and design of these fasteners in order to ensure their proper use. Fasteners are probably one of the aspects of mechanics that is given the least amount of thought.
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