I did mine the easy way, on both of my renix jeeps.
If you still have the temp switch and just splice into the wires it will act just like OEM, turning on ~220. Flip the switch and the fan comes on also. The fan will only run when the key is turned on.
Look at the drivers side of your radiator, you will find this temperature switch with two wires coming out of it:
Follow the wires a couple inches back and use some push on wiretap connectors or whatever other means necessary to tap into both wires.
Or, If you have a HO radiator like me and therefore no more temperature switch, just cut the weatherpack connector off of the switch and solder your wires on:
Wrap with heatshrink, tape, whatever, and run your wires into the cab, there should be a hole in the firewall big enough to run your wires.
Wire up your switch and thats it.
Keep in mind one of these wires is 12v, so follow precautions like wrapping it in something where it goes through the firewall, etc.
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