I've had this problem ever since I bought the car, the brake lights work when I hit the brakes, but when I turn on the headlights (only 3 out of 4 work?) the tail-lights and markers don't light. I've checked all the bulbs and the stop light failure relay. I checked the inside of relay and visually it looks brand new.
All my signals, hazards, brakes and back up lights work, just not the running lights.
Got any ideas?