With the ignition key on and fan speed setting on high, you should have 12V to the red wire @ the blower module. If you have 12V on the red wire, you would also have 12V on the purple wire (on high setting) going to the blower, if the module is working. If not, you have a bad module and need to either get a new one or go to the salvage yard and get a used one. New ones run about 100 bucks from Advanced Auto Parts.