So, if you do the above here is how it would work.

flip switch one = both fans on low and pump activated.
flip switch two= triggers fans to come on high ((ONLY)) if switch one is on!

 

I am going to try with just one switch first. I think 2 fans on the low speed setting will be sufficient and preserve the battery. I am going to buy the relay you cited above. I already have a wire running from my battery (from my air bag compressor) that I will tap into for the power source.

Thanks for all your help!!!!!!

 

It's late and I don't want to think to much.... but I think I see a problem with the wiring as drawn. We aren't taking into account the normal engine running and IC pump run that is already wired up. I do it all the time. I presently have a switch in cab to run my e-fans manually if I want. I don't always remember to turn them off. If I happened to have this wired up and I started my truck I think I'd then have a dead short at the IC pump. I think you would need another set of contacts on a relay that killed the "normal" power to the IC pump when you had the fans on manually.

 

I dont understand. This is a ground activted schematic.
Basically all he is doing is grounding out his PCM pin to activate the fans. We are not using any power from the fans..
For the pump we are doing the same thing. We have power from the relay and when we ground the activation wire it completes the circuit.
Assume the pump has power and we turn the truck on..
basically you would just have two power wires feeding the pump.

Am I missing something here?

How are these intercooler pumps wired?
Does it have its on relay?

 

Nah you're not missing anything. I am. It's late and long day. I looked at it longer and you're right. Had to think anyway damnit.

 

Damn lol, had me thinking there for a second!
Thought i may have missed something!

Cool, so he should be good to go now!

 

Okay, I am home now. I looked at the intercooler pump. There is a red and black wire. Here is what it looks like:


I am assuming I can tap into the red wire? But can I do the same for the black wire?? Or does that need to go to a ground?

 

Here is a picture of the relay. It is a 5 prong that you suggested.


Do I need to connect anything to the middle 87 prong?

 

No, the middle prong will not be used.

That plug in connects to the pump right?

Trace back the black wire, it should be grounded.

 

Okay, I am going to check it out now.