The window wont go up and down anymore. Its original on an 84. When turn the key in the tailgate i can hear the motor trying to engage, but nothing moves. I cleaned off the electrical connections and still nothing. It just barely starts to turn the cable but the window wont move. Do i just need a new motor. I have duals straight out the back, so its like a fumigation in there when i have the top on. Thanks for your help.