the black and red are hot and cold. the yellow is for fan speed. make sure you look at the Amps the fans are at. Usually they say somthign like 12V .32A this yould mean 320milliamps so you want a 12V adapater that is that or more. If you want more than two fanms you need a power supply that is closer to 1A then you can run three fans I urun 4 Fans of an adapter that is 12V 2A each fan ius rater at .32A

hope this helps

kd_special
kdspecial Reviewed by kdspecial on . Quick Question about fan construction.... How do I set up 2 12v computer fans in my cabinet.....I know you strip the wires, create a parallel circuit, then hook up the wires to a 12 v adapter? Which of the 3 wires on a fan are positive, neut, neg.? Is this schematic correct? Rating: 5