My '83 t-bird headlights (4 lights total 2 high and 2 low beam) are not working (high or low beam). When I pull on the combo switch to change from high to low beam the lights work while I have the combo switch pulled in, but as soon as I let go everything is dark again. I replaced the headlight switch but it didn't help...Is there a fuse or fuse link somewhere I can look (nothing in the fuse box in the interior under the dash). Any help would be appreciated.