1978 Z28.......need help with the correct location of where these wires from the relay are supposed to go. Someone has cut and added things and I can not get the new heater motor to work. Motor was tested before install and worked. This larger tan wire on end of relay has been cut and a wire added to it. It was under the dash and cut. It DOES go hot when the fan switch goes on, but I still can't find issue. There are two smaller Black wires on heater motor....Hot and Grnd, I'd guess. Hot wire goes from motor to relay, then back out of same relay terminal and back into harness. If you run 12v to that wire, the motor still won't run....We need help, please. Thank you!