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I am having trouble wiring a johnson 3 wire electronic float switch to a 3 way switch with manual off and automatic bilge pump operation i need to see a wiring diagram and then i can wire the components together i wired what i thought was correct and tried to test the float switch by holding the float up with no water it seems that should . Ez taking a three wire on a pump and combining the switched power and the float switch power together to have it only in manual switch mode is fine 3 wire pump to two wire switch however in reverse what hes suggested would put both a switched and constant power to the power input of the switch 3 wire setup to a 2 wire switch. Greg pardus general manager for spx flows johnson pump brand discusses our various float switches for bilge pumps on ship shape tv learn more about johns. I just wired the johnson bilge pump with the electromagnetic float switch i followed your wiring diagram thank you i sent the black wire to my on off switch on console the black 3 and brown red wire fused to my battery i tapped into the 2 connected brown wire which were connected at the factory as in your diagram. Re bilge auto float switch wiring bilge wire is most likely a brown color wire with a yellow trace on it for the bilge auto switch to work it should have power to it at all times even if the battery switch is turned off if you have a battery switch look for an inline fuse holder coming off of or near one of the batteries