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I have a 12V DC fan with two wires (black and red). I want to solder it to a Molex 8981 connection (powered by an ATX power supply).

Here are the details for the connection:
Molex 8981 connectionMolex 8981 specification

I'm guessing the fan's positive red wire goes to the +12V yellow wire, but I'm not sure what to connect the black wire to.

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    \$\begingroup\$ It would be better to crimp the wires to appropriate pins and use the matching connector, instead of soldering. \$\endgroup\$ – Adam Lawrence Mar 16 '13 at 20:06
  • \$\begingroup\$ Or, get a matching header and solder the fan to that. \$\endgroup\$ – Adam Lawrence Mar 16 '13 at 20:12
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You don't say what the Molex connector is coming from, but I'm assuming it's an ATX supply of some sort.
Anyway, connect the red wire to the +12V yellow, and the black wire to either of the 2 black ground wires.

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