[Bleedski]

I have coach 347 and after a recent trip, when checking out my coach, I found that neither water pump would turn on.  I checked the fuses (O.K.).  The rocker switch is working correctly.  I spoke to the factory and after ruling out a couple of things the tech suggested a loose ground or wire.  Everything I reviewed checked out O.K.  The thought occurred to me that since my water level was low, that there may be a shutdown mechanism in the system that would disallow the water pumps from turning on.  Does anyone know if this is the case?