Bob, George Harwell here, 03 Monterey Seacliff. Call me at 405 642 0389 and I'll try to walk you through it. The black and gray sensors are buried behind the water bay panel so we will concentrate on the fresh tank first. That sensor is normally OK. If we can get the system working with fresh water then we can proceed to the next. The fresh tank is in the second bay forward of the right rear wheels.