Cooling Fan 3 Wire Computer Fan Wiring Diagram

Chassis and cpu fans may use either 3 pin or 4 pin power connectors.

Cooling fan 3 wire computer fan wiring diagram. Wiring dual cooling fans. There is no fan control. Fan has a 3 pin power connector. Thus instead of using the colors to distinguish the function better try to study the internal wiring connection.

Suggested electric fan wiring diagrams suggested primary cooling fan single speed on off using 12 volt switching devices only for primary activation note. However two fans with 3 wire connectors may not have the same wire colors. 4 pin connectors are usually used by cpu fans with higher power consumption. If the connector fits the pins it ll work and you don t have to worry about the pin arrangement.

If you need to install a 3 wire computer fan forget the wiring diagram. On these 4 wire computer fans i have found that some times they require an input to tell it how fast to spin so simply supplying power to 2 of the wires will not work if you have a 3 wire fan however you can supply power to the red and black and leave the white disconnected. Proper fan connector placement is shown in the figures below. Most stand alone adjustable thermostats i e.

Most computer motherboards come with a standard connector for the fan and it only fits one way. With dual cooling fans there are two methods for wiring up the relay kit. When using a 3 pin power connector with a 4 pin fan header the fan will always be on. Fans and on board fan headers are backwards compatible.

Hayden flex a lite or perma cool brands can provide a 12 volt output when activated. Of course all you need is the red and black wire to run your computer fan but if you didn t know what the extra wires are for this video may help you out. Desktop board has a 4 pin fan header. 3 pin connectors are usually used for the smaller chassis fans with lower power consumption.