Blower motor isn't working
 

Ive got 12v of power at the plug and motor works fine when hooked directly to the battery but doesn't work when installed even though the motor has continuity from the pigtail plug. I replaced the resistor and switch just for kicks to no avail. I have also taken apart and cleaned all the grounds I can find and still nothing. All fuses are good and haven't found any damaged wires yet. I'm not sure where to look next. Any help would be greatly appreciated!