Editing Taurus 2-speed fan control wiring diagram

This is a fully automatic control system, with an optional manual override to turn the fan on high. It does turn off the low side when the high side comes on, and it can be altered to include a low speed temp control switch or manual override as well, simply by replacing the ground on terminal 86 of the bottom relay with your own low speed temp switch, controller, or manual override switch.  8) 

http://www.crankshaftcoalition.com/wiki/images/e/e1/RickracersFanControlDiagram.jpg

These are the temp switches I use, and recommend :
SUM-890017 for the 185° on/170° off switch, and SUM-890018 for the 200° on/185° off switch. 

[[Media:http://store.summitracing.com/partdetail.asp?autofilter=1&part=SUM%2D890017&N=700+0&autoview=sku]]

[[Media:http://store.summitracing.com/partdetail.asp?autofilter=1&part=SUM%2D890018&N=700+0&autoview=sku]]

[[File:http://static.summitracing.com/global/images/prod/large/sum-890017_w.jpg]]

Since most setups like this that I do are for customer vehicles, I tend to make everything automatic so they don't have to remember to turn anything on or off.