I want to replace some noisy OEM 40mm x 10mm fans with good ball-bearing fans, but the only ones I can find are 3-pin (presumedly the third pin is a speed signal). Can I use these with 2-pin connectors? I realize I may have to rewire/change the connector, but will the fan function?
You just shift the connection over so the speed sensor wire hangs off. 50% of the time you'll get the right polarity.
You might also have to reverse the polarity, you can do that by unlatching the connectors through the little slots, but better yet you can just get a pair of thin nose pliers and pull the plastic guard off the board pins, then turn it around and push it back on.
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