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Splicing fan wires

johnqgalt asked
Last Modified: 2008-01-09
I would like to replace an intake fan on a desktop PC and am looking for a visual guide to the wire splicing process. The guide should be clear and detailed, something similar to:
http://www.extensiontech.net/articles/howto/psufan.shtml , but with details on materials and tools used.
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Why do you need a guide?  You can buy fans for your case that already have a wiring harness on them.

Are you wanting to change the PSU fan?
Top Expert 2012

I'm curious, too - most fans come with a connector, either 4-pin molex for a power connector or 3-pin for a motherboard header.  There are also Y splitters for power connectors, in case you don't have enough.  What would you connect a fan to, other than these?
Unless you are changing the connection type, why don't you just make sure they connect in the same manner they currently do?  Are you planning on wiring an inline voltage controller to modify fan speed?  If not I have to agree with callandor... it's always better to spend $2 on commercial splitters and adapters than to spend .15 and 4 hours doing something that already exists. (unless you consider .45/hour a good wage). :)


The intake fan I want to replace connects to the PSU through a shared molex connector, i.e., a red and black wire were soldered into the same connector taken up by another connection. Rather than messing with that, I'd rather cut the wires from the old fan, insert a new one, and splice the wires. A two pin adapter to connect it to the MB would also be OK.

Red wire to Red wire:  Black to Black: skin the ends about 1/4 inch, twist the wires together, and put on small wire nuts or tape well. So no shorting on case.  Done.
Use the method that coral as said.  You will need a wire cutter/stripper/cripper.  I would not use tap, but rather wire nuts wrapped in electrical tape, or a 3 pin connector that you can hook to the motherboard.  I don't know where three pin connectors are sold.
Top Expert 2012
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