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RickW

Bilge Pump Float Switch Test

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The first thing to do is determine if the pump us working in manual.  If it is, then you know that the pump is working.

 

Next lift up the float to see if the pump comes on.  If it doesn't then you will need to check the wiring to see if it is sound.  Check the connections to be sure they are not corroded or loose and broken.  If the connections appear to be sound, lift the float again to see if the pump comes on.  If not remove the float switch, cut the connections.

 

Using a multi-meter set on ohms, place the black negative lead on one wire and the red positive on the other.  Lift the float to see if you get an ohm reading.  If nothing you will need to replace the float switch.  If it shows a weak reading check the wires to see if they have corroded.  They may be corroded on the end of the wires impeding the current flow, cut back some wire and insulation to see if it's better, retest to see if you get a better reading.  If not you may still need to replace the float switch.

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