I saw that Mishimoto posted this over on Tristatetuners.com, so I figured I would post it over here for you guys. I searched a bunch trying to see if this was covered already, but I found nothing.
- 1 x 5 post relay
- 2 x 10 AMP fuses
- 15 feet of 18 gauge wire
Run a 12 volt positive wire to the relay (put a 10amp fuse in this wire). The other side of this relay is the positive connection to the fan.
The ground from your fan can be grounded to the body of the car. Make sure it’s a good ground.
Find an accessory wire to tap off of. This is a wire that becomes hot when the key is in the “on” position.
Tap a wire off of the found accessory and run it to the switching side of the relay (put a 10amp fuse in this wire), and then ground the other side
of the switch.
Wiring your fans like this will make them turn on when the key is in the “on” position (when the engine is running).
Please refer to the wiring diagram below.
Hope this helps!