I want to put a switch in my cab so i can manually turn my fans on constant. Anybody have a diagram of how to do this?

 

Just put two switches that are T'd off of the two trigger wires. Run the switch to a ground and thats it.

 

NEGATIVE . . . as in that's not going to work . . .

if you're wanting high speed at the command of a switch . . .

Get a 12v diode and place it infront of the A/C tap wire. The diode is so that the compressor will not run when you hit the switch.

 

If you have the 2 pin type harness this will work,



Up is low, middle is auto, down is high. If you have the single pin and AC harness, then I think if you replace the high in my diagram with the ac it should work, but use a diode like tootall said.

 

I do have the single pin harness. Does that mean that the fans wont have both speeds? Is the switch in the diagram a 3 stage switch? I just want a simple on/off switch to turn both fans on high for when its 100+ deg, on a dyno, etc. Mainly so i can get the fans on ahead of time before i put it on a dyno and still have them work.

 

Also, should i splice the wires and then put the diode between the splice and the switch? Will I need a diode for both wires? Sorry for all the questions but I know nothing about wiring lol

 

that should work

when the switch is in the middle the fans should be on auto, when flipped up 1 fan will come on high (or both on low, not sure), and when flipped down both should come on high and not engage the ac clutch.

 

Is this the only option though? I would really rather just have an on/off high.

 

This will work exept the low speed/pcm trigger wire needs ground to activate and the high speed/ac trigger wire needs 12v. I got 12v from a constant sourch so I could cycle the fans and cool the truck when the truck is off.

 

I was wrong with the single pin style harness the diode is needed.