Hi I need some help. Working on a 79 tailgate window. Just re placed the shell took everything from the old one to the new one. The window works intermitenly. Open the window and close/slam the tailgate and I loose power to the motor. Pull the motor plug apart and sometimes no power at the plug. Sometimes leave the plug pushed in halfway and the window works until you close the tailgate. Somtimes the motor plug is warm, will be replacing the plug on Friday. Also put a NEW window motor in old one was slow and drew alot of power. Any ideals anybody?? Thanks for your thoughts.