I just were given this pc fan and it has a three pin connector, i recognise the cord with the white stripe is fantastic however how can i find out which of the other two wires are terrible?. If you're seeking to parent out which wire is ground at the fan itself, and you do not have a connector, then simply join 12v to the center twine and try floor on either of the outside wires. When the fan spins, you've determined it. The opposite, if connected, is a tachometer. Connecting it to ground briefly might not reason any harm. 2. Move the currently eliminated pink wire of to the center pin of the molex connector that is housing the floor to your 3-pin fan cord. ?(the floor to your 3-pin fan wire was connected to the icsp headers in your original printrboard. ?click on right here for photograph.).