Mine is wired from the float switch to the battery switch with simply an on off switch at the helm. I like having my batteries isolated completely when off, but others like hooking the float switch straight to one of there batteries. And yes, if you have the 3 way switch and your bilge gets water it will not pump out unless the switch is in the auto position. I've also seen people add an extra float switch higher up as an emergency protection that is straight to the battery.
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2011 SUNDANCE B20CCR SKIFF, 2011 YAMAHA 90HP 4 STROKE, 2011 KARAVAN SINGLE AXLE ALUMINUM TRAILER, LOWRANCE ELITE-7 HDI, MINN KOTA RIPTIDE TROLLING MOTOR
2000CC HYDRA-SPORT 225+HP EVINRUDE SOLD 
AND THE PINK JEEP!!!! R.I.P.
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