My sump pump is running longer than I remember and after doing some research someone claimed that piggyback switches can electrically wear out the float switch plug. Is that a thing? After my pump turns off the water level is at least 2” below the absolute bottom of my vertical float.



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You mentioned piggyback switches. Exactly how many float switches do you have? A photo would help.

Although I have seen wiring, plugs & outlets corroded by sewer gas in our septic systems, that tends to cause total failure after a short period of sparking and hissing. If your pump keeps pumping after the vertical float is all the way down, it is likely controlled by a different float switch, the "piggyback" one.

I should have stated that my research indicated that the current from the pump plug wears out the piggyback float switch plug. Weather or not that was the case, my problem was fixed my getting a new $40 float switch and using the same old pump. Pump was running for 50 seconds with old float switch and only 8 seconds with new float switch. I’m glad I didn’t burn out my pumps motor



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