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Bilge pump help

Posted By: KWood_TSU

Bilge pump help - 07/22/19 03:14 AM

I'm by no means an electrician, I know red goes to red, and black goes to black, and that's it.

So here's what I'm looking at doing. I want to hook a bilge pump up to a momentary on toggle switch to a 12v feeder battery.
Is this possible, if so, elementary explain it, a diagram would be the best help too.
Posted By: Shotgun Willie

Re: Bilge pump help - 07/22/19 04:01 AM

[Linked Image]

This what you need?

The pump will have 2 wires coming from it, positive and negative. Negative will run directly to the battery. Positive will run to one of the tabs on the switch, then you'll run from the other tab on the switch to a fuse, then to the positive side of the battery.

The fuse isn't 100 percent required, but it is recommended. If something shorts out, the fuse will keep the wires from turning themselves into a handy little pocket warmer. Size your fuse slightly higher than the max amp draw on the pump.
Posted By: KWood_TSU

Re: Bilge pump help - 07/22/19 04:16 AM

I think so, just need to find the switch now.
Posted By: bill oxner

Re: Bilge pump help - 07/22/19 01:13 PM

Originally Posted by KWood_TSU
I think so, just need to find the switch now.



Gat mine at Academy. Should be able to find them almost anywhere.
Posted By: hopalong

Re: Bilge pump help - 07/22/19 01:22 PM

you will need more than a feeder battery to be able to use it very often, they draw about 5 amps.
Posted By: KWood_TSU

Re: Bilge pump help - 07/22/19 02:21 PM

Originally Posted by hopalong
you will need more than a feeder battery to be able to use it very often, they draw about 5 amps.


What would you consider very often? I'm looking at momentary use for about 3 hours before a recharge.
Posted By: 603Country

Re: Bilge pump help - 07/22/19 02:42 PM

As I was madly filling a shopping cart at Bass Pro on Saturday, I noticed that they had many bilge pumps of all sizes. I’m guessing that they come with wiring instructions.
Posted By: redchevy

Re: Bilge pump help - 07/22/19 03:54 PM

What is "momentary" use?

I don't think a feeder battery will run it for 3 hours.

Battery has an amp hour rating, it will tell you how long it will last at what draw. I find with batteries its much better to go way over gunned than under, especially because as the batteries age they don't hold out as well.

I would say get a lawn mower battery at minimum, at Walmart this time of year they cost the same amount as the feeder batteries.
Posted By: PMK

Re: Bilge pump help - 07/22/19 04:55 PM

attach a battery tender to the battery ...
Posted By: KWood_TSU

Re: Bilge pump help - 07/22/19 06:12 PM

Originally Posted by redchevy
What is "momentary" use?

I don't think a feeder battery will run it for 3 hours.

Battery has an amp hour rating, it will tell you how long it will last at what draw. I find with batteries its much better to go way over gunned than under, especially because as the batteries age they don't hold out as well.

I would say get a lawn mower battery at minimum, at Walmart this time of year they cost the same amount as the feeder batteries.


Like an automatic switch. For boat livewells they'll run for a minute, off for two minutes.
Posted By: redchevy

Re: Bilge pump help - 07/22/19 06:24 PM

Your going to need to figure out how much run time you need and how long your battery will put out that current. My guess is a feeder battery will do fine for a little bit but is going run out of juice. Also if your deeply discharging it often it will have a shortened life.
Posted By: CharlieCTx

Re: Bilge pump help - 07/22/19 08:23 PM

You also need to know the amperage draw to make sure you switch can handle it, I've melted switches before which is how I've learned this topic.

Since its 12v, best (maybe overkill) to use a relay. Minimal voltage to the switch.

I would agree with the others, this doesn't sound like an application where a feeder battery would work.

Charlie
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