Hi,

For months, my passenger HID low beam has been getting ever more flaky. It will come on when you turn on the lights, but then goes off. If I turn the lights off and back on, it comes back on (usually) and then goes off again. Sometimes it goes off after 10-20 minutes, sometimes after a couple of minutes, sometimes after a few seconds. The duration has been growing ever shorter.

So, today, I swapped igniters left to right, right to left. Fired up the headlights and waited. After a few minutes, passenger light went out again. Since the problem didn't follow the igniter to the other side, I assume it is not the igniter. Next, I left the igniters where they were and swapped bulbs. Again, after a few minutes, passenger side went out again. At this point, passenger side now has the igniter and bulb that used to be on the driver's side and only the ballast remains unchanged.

Logic tells me that the only thing that is left is either intermittent wiring (unlikely, since it always comes on when first switched on) or the ballast. But, ballasts so expensive, and not returnable, that I am hesitant to buy one, even though "logically" I think I have narrowed it down to the ballast.

Am I missing anything obvious?

Any thoughts would be appreciated!

thanks, bruce