2006 hyundai tucson
 

I am working on 2006 tucson v6 has heater blower problem,blower is working when i jump it.relay and resistor has been replaced still not working.i smelled burning wire from heater controller uni(manuel) i got one from junk yard and install it.blower worked for seconds and burned the second unit that i installed.something is shorting out the unit but don't know what? Is there anybody had the same problem and figured out what it is?