One of my ballast pumps will fill but it will not empty. I swapped out the switch and had the same results so it isn't that. It is supposed to just reverse the polarity when flip it to empty right? It doesn't make sense that it will run in the fill mode but not the empty mode. Is it something in the internal wiring of the pump maybe? Any help is appreciated. By the way it is a Jabsco Water Puppy pump.
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