MBWorld.org Forums - Bulb or ballast??? that is the question

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Bulb or ballast??? that is the question

warning light came on....2002 CLK 430....changed out Xenon bulb on passennger side...a day later...it was out...dealer said probably ballast...so to test i put new bulb in driver side...initially it didnt work, then it did...then for a few days it would work, then going to work my wife says drivers light doesnt work, then shut off and restart, it works....To me these seems like bulb...
are Xenon bulbs finicky? can i have a faulty bulb?:confused:
or conversly.....can i have finicky ballast? that works on and off?

Quote:

Originally Posted by Ken.horrigan (Post 6224587)

so, changed the bulb out, and both headlights now work.......BUT, now the one running light (canada) is out........then i banged the hood and it came on....
so tell me...is there individual ballasts for each light? how bout ignitors?
today, my wife says all lights are working....anyone else here of such odd behavior of lights, any solutions?