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  1. March 3rd, 2002 02:58 PM #1
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    krupted
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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. March 3rd, 2002 03:13 PM #2
    mick57
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    not being an electronics expert but i would think earth
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  3. March 3rd, 2002 03:19 PM #3
    DuronClocker
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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. March 3rd, 2002 03:26 PM #4
    mick57
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    guess i'll stick to changing fuses
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  5. March 3rd, 2002 03:35 PM #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...
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  6. March 3rd, 2002 03:49 PM #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).]
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  7. March 3rd, 2002 05:03 PM #7
    F_A_L_C_O_N
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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. March 3rd, 2002 05:08 PM #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. March 3rd, 2002 05:22 PM #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. March 3rd, 2002 07:03 PM #10
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    Yup.

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  11. March 3rd, 2002 08:43 PM #11
    DuronClocker
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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. March 4th, 2002 10:50 AM #12
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    AMD Guy
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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. March 5th, 2002 05:11 PM #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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