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Author Topic:   Auto Bilge Pump
littleblue posted 02-23-2013 09:44 PM ET (US)   Profile for littleblue   Send Email to littleblue  
I have a bilge pump in my forward locker that needs replacing. Currently it has a switch at the console for manual or auto and the pump has a float switch. I'm replacing the pump with a RULE automatic, the type that turns on every 2.5-minutes and checks for water. There are two wires going to the existing pump itself and another two going to the float switch. The new bilge pump only has 3 wires.

I'm having difficulty tracking down the wiring as it goes through rigging tunnels and into the console. Is there a way to wire up the new pump using the existing wiring? And if so what should I do with the extra wire?

littleblue posted 02-24-2013 01:30 AM ET (US)     Profile for littleblue  Send Email to littleblue     
I was advised from another board that this would work. Any other thoughts?
jimh posted 02-24-2013 01:35 AM ET (US)     Profile for jimh  Send Email to jimh     
You can reuse the wires as you like. The wires themselves only carry current, and they won't know their purpose has changed. Since the circuit was previously used for a bilge pump, the color coding of the insulation ought to be appropriate for the new purpose.
jimh posted 02-24-2013 01:36 AM ET (US)     Profile for jimh  Send Email to jimh     
I looked that table of information in your link, but it does not make any sense to me. The best way to describe a circuit and its wiring is with a schematic diagram.
littleblue posted 02-24-2013 02:04 AM ET (US)     Profile for littleblue  Send Email to littleblue     
Sorry. The left column of information represents wires from the new pump. The right column of information represents wires from the old pump.

This translates to brown/white wire from new pump to brown wire from old pump + wire lead from float (2 wires from the old pump connecting to one from the new).

Then the brown wire from new pump to the other lead from float from the old pump.

And finally the negative wires together.

I'm not certain how to determine which of the two leads from the float switch should go to brown/white from the new pump and which should go to the solid brown to the new pump...if that makes sense.

jimh posted 02-24-2013 09:23 AM ET (US)     Profile for jimh  Send Email to jimh     
I have no idea what the table designations do or mean. I don't know what the old circuit looked like, and I don't know what the new circuit looks like. So a table that tells me about wire colors in the old circuit and how to connect them in a new circuit requires that I would have to make a great deal of presumptions about both the old circuit, its wiring, its colors, and the new circuit wiring. For those reasons, I cannot comment about the data in your table.

As for the installation of the new pump, just forget about what the wires did before with the old pump. Cut off all the old connections, leaving as much of the wiring as possible so you have the longest leads. Identify and label the four wires you have now as A-B-C-D. Look at the schematic diagram for the new installation. Decide how you want to wire it. Wire the new installation according to the schematic diagram. Pick the conductors to use from your A-B-C-D options, using the wires whose insulation color makes the most sense. If you have one conductor left over, just tape the ends shut and leave it there for use in the future.

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