1997 Dodge Ram Blower motor problem

The blower motor on my truck is not working at any speeds. This is on both heat and a/c. So far, I have determined there is power at both the blower motor and resistor. I have also bench tested the motor. It seems to be just fine. I was able to figure out that there is no ground at the motor. Where do I begin looking for my loss of ground issue? Can the resistor cause this?
Any advise will be greatly appreciated!