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Old 08-15-2016, 04:27 AM   #1
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Default Mid bilge or ac condensation pump???? 99 3700SCR

Ok next question for my 1999 3700 SCR,


I have what looks like a bilge in a box will at the same time I have 2 other devices under this hatch as well, I would like to know what these are and where I would need to find out how they turn on or off, the pump in the box I have pulled it out and took it apart it feels locked up so I have a new one on order

Please help me learn my boat lol, I want to make sure that I can give the care that so many other maxum owner give they're boats.

This is the cubby hole in my gally / salon




This is the pump and box in question what is this setup too, it looks like its a pump for condensation over flow

this pump is a Attwood Sahara series s500 model 4505



Here is 2 more devices

I cant see the name of the red device, how ever the blue one says Sure bail on the top of it.
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Old 08-16-2016, 12:06 AM   #2
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sump pump. most probably one line from your a/c condensation, another from your shower. looks like an automatic float under the pump inside the box.
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Old 08-16-2016, 12:23 AM   #3
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I do apologize some how this post wasn't posted so I recreated but when I use the shower the water does not go down here but it does pump over board from a pump be hind the shower under the passenger seat
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Old 08-16-2016, 01:01 PM   #4
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Picture #3 (1-3) is a sump box. It appears to have two inlets and a discharge outlet. Obviously the discharge outlet goes to a through hull to discharge overboard. AC's and showers are commonly routed to these. If it's not the shower, then do you have 2 AC units on that boat? There would be an AC drain for each unit.

The last picture shows a blue float switch connected to the red bilge pump.
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Old 08-17-2016, 02:26 AM   #5
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Thank you Shrew, Ive got the sump pump for the ac to work by turning on the batteries. how ever I haven't been able to get the red pump to push water out let alone to turn on the switch on the dash board doesn't lite up and its labeled mid bilge
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Old 08-17-2016, 07:12 AM   #6
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The old blue float switch had failed on my boat and I replaced it with a new one, no problems since.

I would start by checking if the float switch works, use a multimeter, and then try the pump with a direct 12v feed. That should tell you what is and isn't working.
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