I have recently purchased a 1987 Jeep Grand Wagoneer. The previous owner stated that all the electrical components worked fine until he replaced the engine. Now, the electric seats, the power locks and the tailgate electric window do not work. I have read several of the other entries which discussed window track problems, 30-amp fuses, etc. but do these particular accessories share a particular connector or breaker? Also, how do I get into the rear tailgate to check the condition of the motor, tracks, etc?