It's quite possible there is a wire break at or very near the "plate". Often wires get pinched or excessively bent at that location. If one is broken, you'll likely be able to feel it by moving the wire - there will be an extra 'flexibility' where it's broken. Kill the power to remove the plate, just in case it's a pinch. You could take a shower in sparks when you lift the plate .
HTH,
PopS
6-8 : inches in diameter. A PVC water pipe also goes thru the center of this : plate. : : I have not removed the plate, to see if there are any other : connections in the two wires that might be bad. Do the two wires : usually run straight from the a/c feed to the pum or are there other : connections that I might examine? : : I have called a well company. They will come Monday, but I would like : to fix it myself if it can be fixed without pulling the pump. : : PaulF