If you live in an area that uses salt for ice control, you might also have the various grounding points of your wiring harness checked. My F250 had the same issue, but included intermittent turn signals, radio would come on by itself, blower would come on with key off... Was truly annoying to go out to find a dead battery when there was snow to plow.
Hi that the resistor heater that is shorted out under the glove box remove the plastic cover after that you will see the blower motor and beside that the resistor there 7 32 socket or 5.5 mm change that resistor with a new one saw that problem many time at my shop drain the battery dry when you dont notice it good luck and thank you for using fixya
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