PC fan wire colors

Hello blix83

For the fans, we more often see the functions indicated by Oblivion19500.

I have the impression that each manufacturer does a bit what they want.
So if your indication is accurate for a particular fan, it would be interesting to specify the fan/PC or motherboard model so that your response serves as a good reference.

Hello Hugdj199
Sometimes we find
black=-
brown=+(12V but check the voltage should be marked on the fan label)
gray=speed indication of the fan

Hello nettlebay
I have an intel that has on the cpu fan connector of the motherboard
Black=ground(-);Yellow=+12v;Green=rotation
Thank you.

OK! Thanks... I tested it. However, I thought that by reversing the polarity we could make it turn in the other direction. But it doesn't work. It is currently powered by an old Sony-Ericsson phone charger of 4.9v (which, curiously, doesn't heat up).. Not very efficient. I turned it around so that it works as an extractor. It's positioned on my Gigabyte Brix which is itself on a Vesa mount. The Brix BXBT-2807 is fanless but since I'm in the Caribbean, it gets hot in the summer! I will try with a more powerful transformer.

Hello
Yes, the phone has a lithium battery: the charger probably measures and limits the current as well, which is why it doesn’t overheat.
It’s also normal that the fan only spins in one direction: the shape of the blades is not symmetrical, it would be completely ineffective if it were spun the other way around.
You can apply between 5 and 12v, the speed should increase with the voltage. The fan's power is listed in watts on the fan's label, and the transformer should be able to provide at least that much at 12v. The Brix power supply provides 12v 2.5A; we should find this 12v in the Brix, but the warranty won't cover any damage just in case...