Here is Earl's Taurus fan wiring. It's very simple to wire...the red wire goes here and the other red wire goes there.
yep...it was simple and quick...it took me a little longer to wire mine because i had to hide my wiring... ......
we were able to hide them...they were used under the dash to bring power out from the fuse box to the relay...
...that's nice... that might be the answer to this fan install... my twin sensors are 10 degrees apart...i am thinking about moving the high temp sensor up to 205 from 195... the reason...i shut my car off at 184, the fan hadn't came on to the low side (185). the heat in the motor went up to 195 while sitting. by doing this, when i started the car the fan came on to the high side. it ran about 5-7 secs. and then went to the low side. this high speed startup situation only happened at a...short stop.(just gassing up). ...thanks Nick...:Handshake PS...maybe Jay will add this link to his tech article...
It doesn't have to be all that complex... I just use one of these along with a 60 amp circuit breaker and a relay. I've run them on my past three vehicles and installed them on two others. The only problem I've ever had was finding out a 30-amp relay like I've used for everything else wasn't good enough for the Taurus type fan. (Thanks, Frank) Edit: Of course, I am not using two speeds... But I could, with two of these adjustable controllers.