If I am not mistaken you are using an "on demand" pump. Which means that it runs when it senses a demand. No accumulator tank is needed and often if one is used it interferes with the pumps designed cut/in cut/out characteristics. Especially if there is a minor leak in the Accumulator tank. The pump will continuously run at very slow speed. That may have been the original problem and not water on the switch. You should also fuse the line in to the pump if not already.
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