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I have a blower motor issue in my 2007 5.9. I've replaced the resistor was ok for awhile. Took it out and cleaned with contact cleaner was of for awhile again. With switch off there is about 1.4vdc to the motor. Is the speed switch bad? is the resistor bad again? Need help Thanks
 

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My advice would be to simply replace the entire motor unit to eliminate it as the source of the problem. The 1.4VDC that you are seeing might be just a form of "standby" power that the unit receives but I'm not an expert when it comes to car electronics, I'm more of a mechanical sort.....
 
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