Computer Cooling Fan Wiring Diagram

The ins and outs of a 4 wire computer fan.

Computer cooling fan wiring diagram.

Relays shown in these diagrams can provide options. A pc fan s wire colors are pretty consistent with red almost invariably marking the positive and black marking the negative or ground. Used 4 wire fan for these two projects. Suggested electric fan wiring diagrams suggested primary cooling fan single speed on off using 12 volt switching devices only for primary activation note.

You can use almost all standard 3 wire cooling fans with this adapter circuit. Video of the day. Start your wiring project by taking both of the positive wires from the fans and run them to the yellow wires on each relay tab 87. Most stand alone adjustable thermostats i e.

It uses a 40 amp electric relay and electric fan sensor. However for optimum performance it may become necessary to slightly change the values of components c1 r4 and c2. You don t need it to make the fan turn but the third wire is there for a good reason. The third wire varies depending on the manufacturer but usually it is blue or yellow.

Hayden flex a lite or perma cool brands can provide a 12 volt output when activated.