Blower motor resistor

[hanger]

What would cause the blower motor resistor to fail? I installed a new one and it failed in 3 days. I put a jumper wire in and the motor turns fine. I checked the volts with the blower running and only had 10 volts.

[Stuka]

By fail, do you mean it goes open, so the motor stops turning completely?

[hanger]

Yes

[sonoraed]

Generally speaking if the resistor fails by burning thru the resistor coil that indicates too much amperage load from the motor/circuit/connector,also have seen resistor fail when their not in some kind of air flow to cool them down,also bad or no grounds can really create head scratching problems