While cleaning the bilge in my boat, the pump did not go on automatically. I turned the switch on and it emptied the bilge, no problem. I have never worked on what appears to be a "sealed" switchbox on the newer Gradys. I have always had the old "float" style switch. How do I check the new style to see if it makes continuity when it should? It isn't as simple as raising the float anymore. Thanks...george