Electrical problem

[slush281]

I have a 2002 x5 3.0i and am having some strange electrical issues. The back right trun signal and brake light and left front turn signal do not work most of the time. On occasion, the turn signals will blink for about 20 seconds and then stop. Also, the left high beam does not work most of the time. When I bought the car, they put a new battery in. I have tried resetting the computer by disconnecting the negative battery terminal for an hour. Also, have checked all the bulbs and fuses and they are working. I tested the back tail light wires and am not get any power at the plug. Anyone have any other ideas before I take it to a shop? Thanks!!!