I just got this PC fan and it has a 3 pin connector, I know the wire with the white stripe is positive but how can I find out which of the other two wires are negative?
If you can't see the photo, here is a link to it: http://i.stack.imgur.com/QQYmk.jpg
Answer
PC fan pinouts can be found easily online:
If you're trying to figure out which wire is ground on the fan itself, and you don't have a connector, then just connect 12V to the middle wire and try ground on either of the outside wires. When the fan spins, you've found it. The other, if connected, is a tachometer. Connecting it to ground briefly won't cause any harm.
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