We needed to add a new switch to the electrical panel. There’s this thing in the bilge called a “float switch” (actually there are several float switches/bilge pumps in the bilge). When water gets to a certain level in the bilge, the water pushes the float switch up to a point where the float switch turns on the bilge pump. The bilge pump then starts pumping the water out. We needed to add a switch that would enable the float switch to be able to turn the bilge pump on and off without the bilge pump running all the time.
I do that with all my bilge pumps.
Oh wait, I don’t have a boat.