All of the water pump controllers I have seen so far have been within a foot of the water pump. Without knowing exactly how your Tech did the test there is no way to determine anything more than the pump works. Was the 12v wire to the pump pressure switch checked for power? You stated the "4 switches work". Does that mean the water pump "ON" light goes on and off?
FYI, the controller switches the ground wire of the pump and the 12v wire runs through the pumps pressure switch. If you follow the pumps black ground wire it should lead you to the controller.
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2012 Monaco Knight 36 PFT
Towing either a 2019 Jeep Grand Cherokee Overland or a car in a 20' enclosed car trailer.
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