Light Problems

[87 300 SDL]

My 87 300 SDL the passenger headlight seems to have gone out. When I interchanged the bulb with the working driver's side still didn't work. Placed the original bulb back in and checked to see if the high-beam works and it did. Also odd is that the driver side, side-marker seems to have stopped working also. It works when the turn signal is on, but not when the parking light. Checked the rear lights and they are working and all the fuses are ok. If anyone has any ideas/advice I would appreciate the help.