A6 Quattro, My left headlight is not working. I've tested out the bulb and it's still working. I changed out a new ballast and still doesn't work. Not sure if it's the cable harness from light to ballast. Also checked out all the fuses and till not working. Can anyone think of anything else that would cause the headlight not to work? TIA.

 

Check all the wiring and connectors also.