Thanks LATECH you were correct. It took me a while to figure it out because I assumed, incorrectly, that since the underdash courtesy lights were working then the fuse had to be good. After staring at the wiring diagram however, I realized that the front and rear courtesy lights were on seperate circuits. In a 70 conv GTO the fuse labeled "tail" in the fuse box is responsible for the rear courtesy lights and the hazard flasher circuit (which I also realized were not working). I just changed the fuse and now both are working! Thanks guys!