I am having a problem with some of the electrical in the rear left of my car. My antenna, rear left window, rear dome light, rear left reading light, and rear left door sensor have stopped working. It will sometimes start working again if I hit a bump while driving it. So my question is: is it just a loose connection somewhere, and if so where? or might it be a bad fuse, and what fuse might it be? Any insight to this would be helpful.

Again my car is a '89 300se w126.