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Keep blowing fuse with new sink pump
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gbrady28
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Joined: February 05, 2006
Posts: 56
Location: Bend, OR
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PostPosted: Fri Jun 11, 2021 3:57 pm    Post subject: Keep blowing fuse with new sink pump Reply with quote

I just bought a new 12v sink pump, the one that goes inside the cabinet under the sink, and a new faucet and I can't figure out why the fuse is blowing immediately. I had a short in the old wiring so I decided to just run a new wire from my aux battery. I have the positive and negative wires running from the positive and negative battery terminals to the faucet and then from there spliced down to the pump. As soon as I try to put in the 15amp inline fuse it sparks and blows immediately. It's brand new wiring that's only about 3 feet long so there's no shorts. I only used 16ga because I had some on hand and figured for such a short run that would be fine but could that be causing it? I can't see any other issue.

Thanks for any insights!
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crazyvwvanman
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PostPosted: Fri Jun 11, 2021 4:50 pm    Post subject: Re: Keep blowing fuse with new sink pump Reply with quote

You are wiring it wrong. Run only 1 wire from the battery to the faucet, a fused power wire. The other faucet wire goes to the + wire of the pump. The - wire of the pump goes to the battery - connection.

Mark

gbrady28 wrote:
I just bought a new 12v sink pump, the one that goes inside the cabinet under the sink, and a new faucet and I can't figure out why the fuse is blowing immediately. I had a short in the old wiring so I decided to just run a new wire from my aux battery. I have the positive and negative wires running from the positive and negative battery terminals to the faucet and then from there spliced down to the pump. As soon as I try to put in the 15amp inline fuse it sparks and blows immediately. It's brand new wiring that's only about 3 feet long so there's no shorts. I only used 16ga because I had some on hand and figured for such a short run that would be fine but could that be causing it? I can't see any other issue.

Thanks for any insights!
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gbrady28
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Joined: February 05, 2006
Posts: 56
Location: Bend, OR
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PostPosted: Fri Jun 11, 2021 5:05 pm    Post subject: Re: Keep blowing fuse with new sink pump Reply with quote

I knew it was something easy. Electrical is not my forte. Thank you for the help!
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VicVan
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Joined: July 01, 2015
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Location: Vancouver Island, BC
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PostPosted: Fri Jun 11, 2021 5:06 pm    Post subject: Re: Keep blowing fuse with new sink pump Reply with quote

What Mark said, as always.

The way you wired it, when you turn the faucet on, you are closing the cicuit between the two wires that run to the faucet. So you are connecting the battery + to the batery -. Basically, you're creating a short. Good thing you put a fuse!

Here's what Mark said but in a drawing:
Image may have been reduced in size. Click image to view fullscreen.

(in your case it's not a lamp, it is a pump. The switch is the faucet).
_________________
'90 Westiti, 2.1 auto
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gbrady28
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Joined: February 05, 2006
Posts: 56
Location: Bend, OR
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PostPosted: Sat Jun 12, 2021 7:33 am    Post subject: Re: Keep blowing fuse with new sink pump Reply with quote

Thanks, that makes complete sense. I'm going to read up on wiring and better educate myself for future issues (as I know there will be Very Happy )
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