So my drivers side low beam acts up a little less than half the time I flip my lights on. Majority of the time as of recently it has been working better, but occasionally it won't turn on with the rest of the lights. Unless....
I get out and hit the housing with the butt of my hand. As you can all imagine this looks a little ridiculous when I have to pull off the side of the highway (I can't stand having a light out when I'm driving) to turn my headlight on. Any idea of how to go about solving this one? It's obviously not a bad bulb, maybe something gets loose?

 

Personally, I would check the connections on the wire harness for that headlight. Dont only check to make sure the connector is plugged in all the way, but also check that each wire going to the connector is solidly in there.