This morning I found that my headlights weren't working. They had been fine last night. I checked the bulbs and 1 had blown but the other looks fine. My first thought was to check the fuse. Then I found that thers's a separate for for each side. I checked anyway and they're fine too. Is it common for 1 failed bulb to cause the opposite side to stop working? Every single other light on the car works fine, just the dipped headlights have failed.