HELP: Manual fan switch for track use

Here is a write-up I did for the How-To thread for the fan switches. I don't know about the kill switch. (or why you'd even want it)

Here's a writeup I did when I installed some manual fan switches a few months back. The original thread can be found here: http://forums.stangnet.com/showthread.php?t=551641

low-speed fan switch:

A good spot for the switche(s) is in front of the shifter in the bezel, a good amount of room behind there, and you have a ground and 12V source right there (power point). Another good spot, although I would recommend it only for coupes, is in front of the center console, above the foglight switch (and convertible switch if applicable). I wouldn't recommend using this as a spot for a vert however, because the only good close 12V source is the 'vert harness, and vert guys are using this. And if you're like me, then you already have your foglights wired into this also. The fan might be to big of a load for this single wire.

For the switch, you can use a 3-way toggle switch (for high and low-speed on one switch) or use 2 different rocker switches. If you use a 3-way, hook up the wire from the Pin 14 to one terminal, Pin 17 to the other, and then of course a ground (according to the write-up in 94/95 FAQ section, I'm not positive on this, as I used two seperate rocker switches). For the 2 individual rocker switches, on the low-speed fan switch, hook a 12V source (preferably ignition-hot only) (or use the one for the power point, it's constant hot but that's okay) to the power terminal, a good ground (like the one for the power point in front of the shifter) to the ground terminal, and run a wire from the accessories terminal to Pin 14 on the CCRM (dark blue wire). I'm not exactly sure how the high-speed fan hooks up yet, I haven't wired it. But I think you're supposed to run the ground to the power terminal on the switch, then the wire from Pin 17 to the accessories terminal, and I guess the 12V lead goes on the ground terminal. I will verify this information tomorrow hopefully.

I would not recommend using the power point while you have one of the switches turned on, it might be to heavy of a load for it. Better now risk it. If anybody wants more pictures, let me know tonight or early in the morning, cus I can take more tomorrow while I'm wiring the high-speed switch. If anybody is thinking about doing this, don't be afraid!! I was a little unsure of doing this since I'm not very good at electrical stuff, but it was SUPER easy! If you can wire gauges, you can sure as hell do this, lol. Let me know if you need some more tips, I'll be glad to help.

And the high-speed fan switch

Here's how to do it. Run a wire from Pin 17 on the CCRM (it's green with a purple stripe) to your accessories terminal on the switch. Now here's the trick. Run a wire from a 12V source (you'll really want key-hot only on this one) to your GROUND terminal on the switch. If you have a lighted switch (like the kind with the LED in them) then run a ground wire to the POWER terminal on the switch. Don't ask me why the high-speed fan works like this, I'm really not sure. But the reason you want a key-hot only lead is because I wired mine to my power point right there in the bezel (constant hot). It's not problem for the low-speed switch, but now when the car is off, the high-speed switch will light up faintly. When I start the car (or just have the key in the "on" position), it will go off. So it would be best to have it wired to a key-hot source, but I can live with a switch being partially lit (I say partially, cus it glows real faintly when the car is off, not as bright as when you actually flip the switch ) when the car is parked.

When running two seperate switches for low and high speed settings, you will probably want to turn on the low-speed fan first. Then you can flip the high-speed fan on, it's probably easier on the fan that way. But here's the catch, with BOTH switches flipped, the high-speed fan doesn't run at high-speed. For some reason, it runs at medium speed. I don't know, but when I turn the low-speed switch off, then it kicks up even further to high-speed. lol

Definitely a worthwhile mod, since it only cost me $12 ($6 for the switches and $6 for the in-line fuses). Now I run at a steady 180-185* while driving. It actually dipped below 180* earlier on my way to work. Just ask if you need pics or more info.

Here's the switches mounted:


Here's what I run at with the high-speed fan on (before my heads/cam).

I used a SPDT switch and two relays. Wired the relays in reverse of each other so one relay would ground the high speed wire, and the other would supply 12v to the low speed fan circuit.

The SPDT switch has three positions, center is off.

Then I put it all in a nice little box and sealed it up.

I have the power coming from the convertible top harness, so it's switch on ignition as well.

If it went from a continuous power source, im not sure what would happen.

I guess it would work normal for the low speed, but you would have to find a way to activate the highspeed relay with the car off.

Check the Sticky Q&A Thread at the top, I sent Joe a diagram for coming straight off the fan to disable the computer control.

Troy