The fan is powered by pin 19 from the base module blue/yellow wire thats the one with fuses on top in right module box.The fan is turned on at engine rpm of 1500 or greater or 55c.The module box fan ,trans control unit,cluster idiot lights get power from circuit 87 which is fed by that base module.Fuse f2 on the module 10 amp.From the base module pin 27 a red and black wire circuit 87 runs to a 6 pole connection block to distribute power,its near the modules in right rear of the engine compartment to the left of the module box.The ground for the base module is near right fender in front of the module box make sure its not loose