Very common, ive done many. replace the blower motor resistor module, located next to blower motor and also plugs into blower, follow the wire from blower to resistor, heres apicture to help, napa auto parts sells this part,its about $50.00.hope this is helpful.
Do you have 12 volts going to the motor because you said if you put 12 volts to it works check for a ground at motor the blower resistors do go bad on those trucks
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Have you checked the blower motor relay?Why do you say that you have power going all the way to the blower motor?But works if you jump it.
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