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A pontoon boat with one bilge pump in each pontoon uses a single manual switch to operate both pumps simultaneously.▶ 0:23 Nigel Calder explains the builder likely wired them this way to save money on a second switch.▶ 0:00 The arrangement is acceptable because centrifugal bilge pumps can run dry without burning out, so running both when only one pontoon has water causes no damage.▶ 0:49 The manual switch is adequate for basic operation but inadequate for testing: it confirms the pumps spin but cannot verify the float switches.▶ 0:49 Each float switch has wiring routed through its hinge, and water intrusion there causes stray current corrosion that destroys the positive terminal inside the switch, disabling automatic operation.▶ 1:10 Calder notes boats have sunk because owners assumed the manual test confirmed full system function when the float switches had already failed.▶ 1:55 Proper testing requires physically lifting each float switch, or flooding the bilge if the switch is inaccessible, to confirm automatic activation.▶ 1:50 Separate switches per pump are not required, but float switch inspection is.

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