Sorry if threads like this have already been created, I am new.

The blower motor in my 94 S10 Blazer, 4.3 Vortec is finicky. I have a video demonstrating what it's doing but I can't post it here.
In short, the green (for me) ground wire coming off the metal of the blower motor seems to be the problem. Whenever I start the truck or change the fan speed, it immediately drops to the lowest setting possible and doesnt blow. If i jiggle the ground wire, It will go to the speed I set from the panel on the dash. Is there any reason for it to be doing this other than a bad ground? I haven't yet checked the resistor, but Im not sure if that is the issue/

Thanks