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SW Iowa | Do you have a large 8" hand grinder in the shop? Take it over there and plug it in. If it trips the GFI when you turn it on, get a new outlet. If it won't kick it out with that high amp draw starting up the grinder, change the block heater. I had a tank heater(cattle water) and it would trip every couple days. Got to doing it every day then instantly. Tried the grinder trick and it would trip. Tried a few new GFI and then got one that would hold the grinder, and the heater would trip it. Found a bad spot on the heater and replaced it. No more problems.
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Block Heaters & GFCI Outlets
