Picture attached.

I have this but I have no idea what it does...? Not sure if it even works.

Attached Thumbnails

 

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'85 Euro 300D - 258k 4 spd manual
'85 300TD Wagon - 180k - SOLD
Always looking

It adjusts the headlight up/down.

Wow, that is a cool feature...
I don't think my 123 has it...LOL

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1980 240d ,

chain elongation, cam marks reference:
http://www.peachparts.com/shopforum/showthread.php?threadid=10414

http://www.peachparts.com/shopforum/diesel-discussion/305365-9-degrees-chain-stretch.html

evap fin cleaning:

http://www.peachparts.com/shopforum/showthread.php?t=156207&highlight=evaporator

A/C thread

http://www.peachparts.com/shopforum/diesel-discussion/297462-c-recommendations-mb-vehicles.html

The euro lights on my 240D would accommodate it, but I don't have any of the vacuum controls installed.

Interesting, I don't think they are working. Maybe there is a leak in the vacuum line or it has been disconnected.

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'85 Euro 300D - 258k 4 spd manual
'85 300TD Wagon - 180k - SOLD
Always looking

I'm assuming it's on the Euro 300D.

Check your manual. Normal may have been 0 or 1. It's mostly to lower your low beams when the trunk is loaded and the nose shifts upwards so your headlights are on road and not the trees or oncoming drivers.

I think it defaults to full dip with no vacuum and the vacuum pulls the reflectors up. If your headlights were aimed with the engine off, it's possible they no longer have the range of motion to pull anything upwards since that's been dialed out of them.

If there's no vacuum line to the switch or to your headlights then it won't do anything.