So I attempted to wire my fans last night
*Weird I'm kinda leery of messing with them now*
One fan is wired to a switch in the cab, other is wired direct to battery with a reostat inline that controls when it turns on and off via a probe in the radiator.
Cut the main lead on the switch fan and hook to the main power for the reostat. This should give me the ability to turn on and off both fans.
That was my thoughts but the truck hit about 200 last night and the second fan had not kicked on yet I could not reach the reostat to try to play with the temp sensor on it as it was pouring down rain and 12:00 a.m.