My son's 79' 280zx had HID headlights with projector lenses installed by the previous owner. In the past a headlight would go out and we'd replace the bulb or ballast and it would resolve the issue.
Recently however the driver's side headlight went out and I can't seem to figure out why. It's getting power to the ballast (a little over 12 volts) and we installed both a new bulb and ballast but no luck.
My question however is more in regards to the relay harness.
All over the internet I see where a relay harness is used but in the illustrations they contain only one relay and only