"I like Guy's simple idea.
"I like Guy's simple idea. That's how i did my float switch. I didn't want the option to turn the automatic function off...I'm too absent minded to be trusted to leave in auto. I also wired to the B+ so the battery disconnect switch doesn't disable it...Actually I have one of those remote disconnects from Canadian Tire (which kicks ass BTW) and it has a specific terminal for the bilge pump.
Only issue I could have is if I left the disconnect off, and the pump just happened to be running, and I tried to crank the engine...I would be trying to draw starter current through the float switch..but the fuse would simply blow. I also used epoxy for my float switch... I don't like screw holes in the bilge"
Factory Manual Best, Seloc 2nd best, Clymer if you're desperate.