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Old 04-30-2011, 09:39 PM
Chief Village Id10t
 
Join Date: Aug 2010
Location: Houston, TX
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Question What is that last light bulb for?

I had a tail light go out, so I opened the rear lamp assembly for the first time to replace the bulb.

There is a small light bulb (6W) on the outside corner of the light bar which is angled to the side of the car. I tried lots of combinations of key and light switch positions, but I never got this bulb to come on. I gave it a quick look; it appeared OK but who knows.

When is this light supposed to illuminate? I think I read somewhere its called a "side illumination bulb".

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Old 04-30-2011, 09:40 PM
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Whenever the running lights are on. Side marker bulb.
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Old 04-30-2011, 09:45 PM
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The filament likely has a hairline split in it, thats how they generally fail. No one seems to realize that the W123/W126 have a lamp there.
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Old 04-30-2011, 09:46 PM
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And note that they only come on with the running lights or headlights, the one side only standing lights do not activate the side markers.

-J
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Old 04-30-2011, 10:12 PM
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Try turning the headlight switch two clicks to the left with the ignition off.

If that works, then it's the "standlicht" or "parked by the side of the road at night so you turn a light on so nobody hits you" light.
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Old 05-01-2011, 12:37 PM
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those little bulbs often get corrosion on the lamp housing terminals. i deleted mine on the drivers side when i installed my euro spec rear light. if anyone has a eurospec passenger side, let me know.

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