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RM500 Bilge pumps w/built in float sw - oval pump

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RM500 Bilge pumps w/built in float sw - oval pump

Old 02-24-2013, 03:41 PM
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Default RM500 Bilge pumps w/built in float sw - oval pump

Just bought a used boat. It appears the 2 identical RM500 bilge pumps are defective (not the electronic bilge that come on every two minutes). They have 3 wires and float switch inside. Switch on helm is only two position (on/off). Pumps run all the time. Cleaned them, shook them, etc but they keep running so I cut the one brown wire (auto wire) to both pumps and they quit. I can turn them on by the switch but not automatically.
As mentioned above I believe the pumps are defective and just continue to run.
Your thoughts?
C Skip R is offline  
Old 02-24-2013, 04:47 PM
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The pumps are in very good shape if they run all the time.
There is a good chance that there is a problem with the switches on the floats,or maybe the floats are stuck in the "up" position.
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Old 02-24-2013, 05:03 PM
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Originally Posted by rolmops View Post
The pumps are in very good shape if they run all the time.
There is a good chance that there is a problem with the switches on the floats,or maybe the floats are stuck in the "up" position.
True the pumps run thats good but running constantly is not. The float switches are built into the pumps and are not stuck. You can turn the pumps upside down and they still run. They will not cutoff.
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Old 02-25-2013, 05:11 PM
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Okay for everyone who is interested the pumps were defective. Replaced them with the RM500a with same wiring and everything is back to normal.
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