I have an 08 Forester. Sometimes the drivers side headlamp won't come on. This affects both the driving light and the headlamp, so it is not a bulb issue. I've tried wiggling/removing and replacing the connectors, but that doesn't work. What does work is to give the headlamp cover a light, and I mean light, tap. Is there a common ground on the headlight assembly? What else would you suggest checking?