SeanPWright

Thank in advance for any help, I'm new here.

We recently bought our 2008 S 500, and love it.

The other day got a message about Right Headlight, and sure enough it was out.

I bought a new bulb (HID), and replaced it, only to find it still is not working.

I am totally lost in trying to figure this out, hope someone can help.

AZN Optics

Try power cycling the vehicle to reset the front SAM? If that doesn't work, swap the bulb you do know that works to the other side. If it still doesn't work, then might be a blown ballast.

SeanPWright

What do you mean by Power Cycle ?

AZN Optics

lights off, turn engine fully on and off, then lights on.

SeanPWright

Just tried that....no good....and i have verified the bulb is good (switched it out with other side, and it works fine.

Where do i go from here? Don't want to go swapping out parts I don't really need.

AZN Optics

You probably have a blown ballast

SeanPWright

How do i test for that?

Any ideas on where to get a good one besides the MB Stealership? Any idea what the part number is for that?

AZN Optics

You can swap ballasts left and right, but it's more involved. If I remember right, the ballast is screwed on under the headlamp so you'll need to pull out the headlamps. Model number should be listed and you can buy from secondary vendors. I want to say it's an Osram ballast, but not sure.

You can try hitting up one of our other vendors here like Pelican Parts that specialize in OEM parts.

SeanPWright

Is the Light Range Adjuster the same as the Ballast?

MBS430

FYI on ballast in ebay

http://www.ebay.com/itm/162376110773

SeanPWright

Thanks for the reply...that one seems to be newer, the part number does not cross to mine.

I am picking up a whole headlight for $250 tomorrow, and grabbing the ballast off of it, hope that solves my issue.