Comments about Automatic Float Switch:

Switch mounts on a flange on the Johnson Pump

Comments about Automatic Float Switch:

This bilge pump switch lasted 4 years after installing it to by bypass the original bult-in switch in my Rule pump which lasted only 18 months and stuck in the "ON" position.

I leave my boat in the water nearly year-round at my home dock. It appears that the Johnson switch is more reliable than the Rule 35A which appears to have reliability issues according to the reviews.

So I suppose that I will install another one of these. As one of the prior reviews stated, it is important to allow a good coil of wire so that the float will rotate upwards easily. Also, I wrapped a piece of closed cell foam around the float so that it would come on at a lower water lever.

Comments about Automatic Float Switch:

Use must read the manual to address how to route the wires. You must allow about 6 inches of slack to the wires and clamp them into the base to allow the switch to function properly. This is a highly reliable industrial "micro-switch" design.

Comments about Automatic Float Switch:

How hard is it to make a simple and reliable bilge pump float switch? This switch's wires come out of the switch body at the pivot point. The wires move with the float as it raises, which will twist the wires and create resistance against the float. The result is, even when fully submerged, the float cannot raise high enough to turn on the pump. You have to have the wires supported just right for the switch to function. This went into a shower sump, so it's not "mission critical", but there's no way I'd trust it as a bilge pump switch.