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Old 08-25-2014, 09:30 AM   #1
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cpu fans for fridge

I have a old computer with 3 fans inside it, they all say 12v on them. Two of them have 3 wires, black, red and blue. What wires should I use? I want to use one of these in the fridge and wire it to the light inside.
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Old 08-25-2014, 10:32 AM   #2
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Pretty sure the blue wire is a speed/rpm sensor used by the bios on some motherboards. It gives the computer the ability to throttle the fan. For what you are planning a suspect the red/black connections is all you need certainly should wire a switch into the circuit so that you can control on/off.
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Old 08-25-2014, 10:46 AM   #3
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With three wire computer fans the Red should be 12V, black neutral and the third wire is most likely transmitting the fan speed.
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Old 08-25-2014, 11:19 AM   #4
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Thanks, can u tell me what wires to use on the light inside the fridg.
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Old 08-25-2014, 11:51 AM   #5
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You don't want to use the wires to the light inside the fridge. The power is not there when the door is closed. Some people have run wires down the drain tube and picked up 12V at the outside rear of the fridge.

It is more practical to buy one of the fans specifically for this purpose. They use 2 "D" cell batteries and can run for almost a month.
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Old 08-25-2014, 11:57 AM   #6
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Thx, for the reply. I have thought about the fans with batteries, I think I will try that. I have read that people wire into the Hotwire of the light so fan stays on.
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Old 08-25-2014, 02:54 PM   #7
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Quote:
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Thx, for the reply. I have thought about the fans with batteries, I think I will try that. I have read that people wire into the Hotwire of the light so fan stays on.

On the Norcold in our WhiteHawk, the fan shut off when I connected it to the fridge light contacts and closed the door, and I wasn't interested in dismantling an under warranty appliance to connect the fan to the door switch. Just ran a power lead down the condensate tube to the back of the fridge and picked up the 12v. power on a fuse back there. The fans I used were a made up affair someone sells on Ebay for $13. An alligator clip mounts the fans to the fins and provides the ground. Some folks don't care for this arrangement believing it is too noisy. I can't hear it all when it's running unless I open the door.
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Old 08-25-2014, 02:56 PM   #8
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I was able to to use one of the wires in my fridge light connector to run my fan (2005 Eagle).

My BIL's 2010 FW Eagle we had to run the wire down the condensation tube.

Bob
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Old 08-25-2014, 03:19 PM   #9
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On my Norcold fridge the lamp has 12V on it at all times and the door switch takes it low in order to make it illuminate.
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Old 08-25-2014, 03:46 PM   #10
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Neither of our TT's have had a full time hot wire inside so I ran the wire down the condensate drain and tapped into 12V at the outside of the fridge. I've got the same fan that Thomas has. The bride and I think they're pretty handy. Our first one had gotten a little noisy and one of the fans died so I got another one. I'd rather go that route then mess with "D" cells as I have no other use for that battery size but plenty of folks buy them and swear by them.
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