Edorfox did it right. My schematic shows Violet (Hot 12V fan on) and violet/orange(12V when in A/C position or Def Position), though, so your colors may vary. The input to the switch is hot only when the fan is on. The output from the switch goes to the clutch coil through the contacts of a relay. The relay is controlled by cycling switch, high/low pressure switch and WOT relay. WOT relay is controlled by PCM.
If you wire like edorfox, you can turn off the compressor or turn on in any other position. By doing it the way he did it, you retain all the proper cycling switches and safety switches. Since this wire powers the clutch, a relay is recommended as edorfox used. However, a 15 amp@12V capable switch and well installed connectors will work too.
