Wiring problems of the 2002 Subaru Outback

The front headlights are not working. I replaced the headlight but that did not fix the problem. There is no warning light to show the lights are out. This creates a dangerous driving situation that both front lights are out but it seems to be due to electrical or another problem. I have noticed many Outbacks with one light out for the same model years. It seems to be a systemic problem unrelated to the bulbs.