Well thanks, the years are 95-98. I am planning the next phase of the wiring on my truck, which will change the diagram I have on there now. The large fan is in fact two speed. The fan goes into hight when voltage is applied to both hot connections. I'm planning on adding a 3 relay to manually select high on the large fan. Also adding a switch to cut out the ignition pwr to disable the fans (for water crossings mainly.)