Allen,
We went through several pump problems that had to do with the controller on the pump. I talked to ShurFlo and they told me that the company they were buying the pump controller from did them bad and they stopped buying from them. We experienced the same problem with four pumps (Extreme Sensor 5.7). We even had one that did the same as your switch did until the switch burned out. I don't know which pump you have but the one we have will draw a few milliamperes when the switch is turned on and the pump is off. Never did find another pump that caused the pump switch to not entirely turn off. You might check the back part of the switch where the wires are connected and make sure that there isn't a possibility that there is a possible "almost" short between the terminals. Not sure this helps you but at least you know that someone else did experience something similar.
Orv
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