“I know it has three wires and I know the black and red are the power wire and ground but what does the blue wire do or the yellow wire whichever one it is”
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The yellow wire is a tachometer, for reporting fan speed. If connected to a motherboard 3 pin lead, the system can monitor the fans, report if a fan is failing, or of you have the right software, tell you the speed. It isn't critical, though, to the functioning of the fan.
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