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Wiring 2 Fans Together


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tehon3299's Avatar
tehon3299 tehon3299 is offline
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21-Apr-2003, 10:32 PM #1
Wiring 2 Fans Together
I would like to wire 2 fans together so I can plug them both into one fan plug. Should I cut one of the fan wires about half way and then cut the other fans plug off and then splice them together with butt connectors or something? How can I also make it look neat and not all cut up?
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22-Apr-2003, 12:24 AM #2
If you are planning on having both fans hooked up to one fan header on a motherboard, consider how much current they draw so you don't overload your motherboard.

The best way to do it is soldering and heatshrink tubing.

I would cut the plug off both of the fans; making sure to leave plenty of wire on one of the plugs so you can solder the all the wires onto the plug.

make all the fan wires the same length. Solder each fan's wire to the corresponding wire of the other fan. Slide the head shrink tubing over the wires (far enough down, so you don't shrink the heatshrink when doing the next part). The solder the fan wires to the wires on the plug. Slide the heatshrink tubing over the soldered connects and use a heat gun, blow dryer, or light to shrink the tubing.

example.

two fans with no rpm sensing wire.

fan1 + and fan2+ are soldered together, then the connection is soldered to the + of the plug.

fan1 - and fan2 - are soldered together, then the connection is soldered to the - of the plug.

You can skip one step and just solder all of them at one time.

The idea is to make it look like the wires were never separated.

(Just remember, when twisting/twisting the fan wires to the plug wires, don't put the wires side and then twist. Keep them lined up with each other)

Last edited by Shadow2531; 22-Apr-2003 at 01:01 AM..
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22-Apr-2003, 12:59 AM #3
I uploaded a pic to my webspace that you can take a look at.

That's one of the good ways to set up 2 fans to be soldered to the wires of one plug.

(you can make it look a lot better than that. I just threw that together real quick, but you should get the idea)
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22-Apr-2003, 07:30 AM #4
The current draw of the fans shouldn't be an issue, but you'll lose the ability to sense fan speed, since you can't sense speed of two connected fans. I agree with the heat shrink, that's the neatest way to splice things.
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Ian291 Ian291 is offline
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22-Apr-2003, 07:34 AM #5
Sorry to be obvious - but why do not you just buy a power splitter?

See: http://www.mycableshop.com/sku/95321.htm
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22-Apr-2003, 10:19 AM #6
I would like to be able connect two fans to each of my fan controllers on my baybus so that is why i can't use a power splitter. so idealy, i want to wire 8 fans to 4 connections on the baybus.
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22-Apr-2003, 03:40 PM #7
8 fans! Are you trying to cool the machine or get it to fly?
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22-Apr-2003, 04:17 PM #8
hahaha... Well my case has 4 front fans, a fan on the side window, and 2 rear fans. Does anyone have a better idea for controlling all these? Without using 2 baybus fan controllers?
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22-Apr-2003, 07:02 PM #9
Splicing the wires seems to be the way to go...
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22-Apr-2003, 09:26 PM #10
So the only downfall would be I would basically be sending half power (voltage) to each fan?
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22-Apr-2003, 09:41 PM #11
You shouldn't have a problem.

If you are wiring the fans in parallel with each other(which you should be, they will share the provided amperage, but the voltage will stay virtually the same.

So if you have 2 12V 250ma fans that are wired in parallel.

Together they will draw 500ma @12v and if the bay bus only provided 400ma, then the fans will basically share what they can get, but the motors may burn out because they are not receiving enough current and the bay bus might overload because the fans are drawing more than the baybus can handle.

That's just an example. You won't have to worry about it too much though unless you are running vacuum cleaner motors in there.

Last edited by Shadow2531; 22-Apr-2003 at 09:51 PM..
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tehon3299 tehon3299 is offline
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22-Apr-2003, 10:08 PM #12
So by parallel you mean like the picture above?
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22-Apr-2003, 10:12 PM #13
yep
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22-Apr-2003, 10:14 PM #14
Quote:
.. Well my case has 4 front fans,
The noise must be unbearable. You could easily drop 2 of the fronts, they are not really helping things any.
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22-Apr-2003, 10:57 PM #15
so, you are saying that 2 of the 4 fans aren't doing anything?
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