I have a mayfair bilge pump and float switch in my boat. The float switch is only 10 months old and has already stopped working so I am in the process of starting to replace it. The float switch does not have anything stuck in it to stop operation and I can hear the thing bobbling around it it's casing so everything is free. It is just not working. Is it normal for a float switch to go bad in under a year? Also should I just replace the float switch or should I get a whole new bilge pump with the float switch in it as one self-contained piece?