I have a 68 chevelle I am building with factory air. Correct me if I am wrong but I do believe I have to make a ground terminal for the blower motor on the evaporator motor due to the fact thatthe evaporator box is fiberglass and cannot get ground from the firewall. Is this correct? Where does the ground terminal go from on the motor (I assume I would use one of the mounting screws for the blower motor)? Where does the ground wire ground to? Is there a picture of this wiring in the chasis service manual?