dell, so I just connected the fan to a 12v power supply and touched the blue wire (normally a PWM input) to ground, expecting it to shut down the fan (0% PWM) Nothing changed, still ran at full speed. ![]() So I thought maybe my dell test motherboard was being. I thought they might be the standard yellow tach and blue PWM wires of a standard PC fan, but they aren't, I terminated them in a 4 pin fan header and the fan ran at full speed. Update: Broke a bit of the plastic off the back of one of the fans and found the PCB labels for the wires: Black - GND Red - VIN Yellow - PWM Blue - O/F The red and black are positive and negative, but the yellow and blue wires have me stumped. Hello everyone, I have recently obtained a box of like 30 or so delta fans from a source that shall remain unnamed for now.
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