My passanger side headlight went out about a month ago and after searching the forum it was pretty obvious that the ballast had went out since the light would turn on then shut off...So i ordered a new ballast swap the working ballast to the passanger side headlight and put the new one on the driver side and after two weeks of working with no problems the driver side is now out...i swapped the buld to make sure it wasn't it and i still get the same problem with the light turning on then off.

Anyone know what could be the problem? bad ground maybe?