EAsy eaSY ? fan mobo connector yellow black red confused
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Thread: EAsy eaSY ? fan mobo connector yellow black red confused

  1. #1
    Join Date
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    EAsy eaSY ? fan mobo connector yellow black red confused

    The wires on the fan connector (for cpu)are yellow black and red, i bought new fan and it only has black and red wires out of it. my old fan had black yellow red. i just hooked up red to red and black to black and it works fine, but i was wondering what the yella wire does then.....

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  2. #2
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    not being an electronics expert but i would think earth
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  3. #3
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    earth ~ ground. Nope. That yellow wire (I've also seen it blue) is for the RPM speed. It tells your computer how fast the fan is going by sending a small electrical signal to a controller onboard.

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  4. #4
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    guess i'll stick to changing fuses
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  5. #5
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    On molex the combination is:

    black: ground
    red: 5V
    yellow: 12V

    The fan runs at 12V, so most likely the yellow wire will be 12V and red the one for RPM...

    You can always test it you know...

  6. #6
    Justintime Guest
    actually on the fan the Red is 12V

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    [This message has been edited by Justintime (edited 03-03-2002).]

  7. #7
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    I also think yellow is 5V and rpm

    would recommend having 3 wire type so you can see your rpm in bios and also be alarmed if fan stops working

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  8. #8
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    The Yellow wire is for RPM sensing only and does not provide any power and the 3 pin connectors. The 4 pin Molix connectors are completely differant, but red is still +12 and both blacks are ground. The yellow is +5v.

    Ive wired up a few 3 pin fans to power supplies (those fans only have 2 pins and a smaller connector) and other 2 wire untailed fans to 4 pin Molix connectors and 3 pin motherboard connectors. Always red to red and black to black.

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  9. #9
    Justintime Guest
    actually Todd, on the 4 pin molex 12V is yellow and 5V is red while blacks are ground.

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  10. #10
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    Yup.

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  11. #11
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    Originally posted by Justintime:
    actually Todd, on the 4 pin molex 12V is yellow and 5V is red while blacks are ground.



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  12. #12
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    Agreed. The red is only 12V when it is going to a fan (because it is wired to the yello 12V from the molex connector).

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  13. #13
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    allright- i get it now, and yes that is why the fan doesnt run off the yellow, only the red. and the fan itself must have the circuitry to have a yellow rpm wire on it. my old fan does, my new fan doesnt.

    ALL CLEARD UP!

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