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This is what I've done so far and why I had to do it ; Ok,so I totally lost all heater functions , replaced switch,blower motor and heater core. Getting direct power to blower,power from the fuse is good but still no blower action. Any thoughts to what is going on in heater land? Any help would be most appreciated starting to get cold up here in the morning's.
Are you also bypassing the resistor?
If you're running the + "straight" off the battery, without the resistor, & it still doesn't work, make up a ground wire. Bolt the fan motor in place & attach the new ground to one of the mounting bolts & a clean spot on the truck body.
AL.