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Thread: Need help wiring PC fan

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    Need help wiring PC fan

    Salvaged PC fan has four wires. Which is the positive and which is the negative?
    Cant't make it work. Any advice will be much appreciated.

    ---------- Post added at 02:25 PM ---------- Previous post was at 02:24 PM ----------

    Oops forgot the pictures:
    http://i960.photobucket.com/albums/a...s/IMG_3120.jpg
    http://i960.photobucket.com/albums/a...s/IMG_3121.jpg

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    mobile's Avatar
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    Last edited by mobile; 10-30-2011 at 01:43 PM.

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    Class 5 Nepenthes hoarder lance's Avatar
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    Disregard the white and blue wires...those are for speed control..etc
    If you strip back a cord to connect to the fan you will find a red and black wire (maybe w/ some other ones).
    Just twist red to red and black to black together and put a wire cap (or something) on them to make sure you don't ever get shocked. Make sure the cord you choose is more that 5 volts or 12 volts or less depending on the speed you want for the fans. If you connect 2 fans to one cord make sure the input is 12 volts.


    In addition to growing plants, I design and build RC planes powered by Tesla batteries. Check out my progress at www.chargedplanes.com

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    31drew31's Avatar
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    Ignore the blue and white wires, and refer to this post:

    http://terraforums.com/forums/showthread.php?t=127945

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    Nope. It doesn't work. Checked proper voltage and all that. The fan is dead.

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    Class 5 Nepenthes hoarder lance's Avatar
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    Its circuit board probably blew....it happens
    Try searching a computer junk yard if there's one near you


    In addition to growing plants, I design and build RC planes powered by Tesla batteries. Check out my progress at www.chargedplanes.com

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    does this rag smell like chloroform to you? boxofrain's Avatar
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    local PC repair shop

    will have a small mountain of used fans. Many will also have the phone charger/adapter to hook to for the wall end.
    "the memories of a man in his old age, are the deeds of a man in his prime"

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    jesse's Avatar
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    Quote Originally Posted by riceman View Post
    Nope. It doesn't work. Checked proper voltage and all that. The fan is dead.
    Did you also check the max. current of the AC/DC adapter?

    I just checked the specs of your fan (from the ID on the picture and searching the Internet):
    > Rated Voltage : 12V
    > Operating Voltage Range : 4 ~ 13.4 V
    > Input Current : 1.60 Amp
    > Input Power : 19.20 Watt
    > It comes with 4 wire lead (white=TAC sensor, red=power, black=gnd, blue=PWM control)
    > to 5 pin Dell connector

    This is a very strong fan that draws a lot of current.
    The 12V AC/DC adaptor should have a rating of at least 1.6 Amp = 1600 mA or more.
    Has it?

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