I recently got some H4 hid kit (some unknown brand).

they were good for about a month, now i got a problem.

My left hid won't light on.

I wanted to see if the bulb was wrong, so i switched left and right (bulb only)

and it worked fine for 1 day.

next day left hid out again........

Now i know is not the bulb, so i'm left with 2 choices ballast and ignitor.

Anyone have any idea how can i know which is bad?

Or if nothing is bad, what the hell is goin on?