“I bought this from Best Buy yesterday not realizing it is a four-wire fan. Problem is I need a two-wire 12vDC fan, so could I wire this to run with two wires instead of four? Maybe pair up the two sets of wires, gray-gray and black-black? Thanks”
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Yes, just connect 12Vdc to the power wire and ground, or common to the GND wire. Each of the four wires has a specific purpose. 12V for power input; tach pulses to measure speed output; a PWM speed control input; and GND common to all the other. So, in your situation, you'll only use two wires, and two will not be used. The fan's spinout matches the standard found on motherboards over the past 15 years - that is why I'm not putting it here.
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