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Headlight Question - Round Knob on the Headlight

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Old 09-19-2010, 12:19 PM
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Headlight Question - Round Knob on the Headlight
Hi:
Does anybody know what is the purpose of the round knob located in the
back of Hella headlight (2002 C240 for the US) as I indicated in the attached image?


Thanks,
Jim
Attached Thumbnails Headlight Question - Round Knob on the Headlight-w203hellaheadlight.jpg  
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Old 09-19-2010, 04:45 PM
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Isn't that the location of another bulb? I really don't know just guessing.
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Old 09-19-2010, 07:15 PM
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I think it's a cap. Like a cover for another bulb. Take it out an see.
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Old 09-19-2010, 11:31 PM
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I did open the knob but it has no bulb. I am guessing it may be used to
adjust the low beam, may be for the horizontal adjustment.
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Old 09-20-2010, 01:11 AM
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Yeah in there are the gears and the bushings that rotate to adjust the horizontal position of the low beam bulb. I don't recommend opening that knob unless your horizontal adjustment doesn't work and you're trying to repair it.

No extra bulbs in there.
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Old 09-20-2010, 06:39 AM
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if you look it moves the chrome piece inside the housing
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