Ok, Look at the pic provided. Shouldnt there be some bulbs where there blue line is at? I mean on most W126 I have seen, this has never lit up and has no bulbs. But when you open them up and look inside, you see a place for bulbs. I would like to know how to wire this to work?

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Only on the drivers side and only if you have a rear fog light.

The euro spec cars do - I'm not sure about the US spec.

Does your headlight switch have a yellow/orange dot in the centre of the switch?? Can you pull the switch out 2 stops? if so then you have the correct headlight switch for the rear fog light and should have a bulb fitting only on the drivers side tail light assembly.

Cheers

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1988 W126 420 SE

beware of fundamentalists!

You are right 420 SE, all Euro specs. has the left fog bulb and only one while the right tail has a place for the fog bulb but empty; they put a place for the right steering drive. And as what 420 SE said, u can pull the light switch once to turn on the front extra light and twice to turn on the tail fog bulb. When u pull it twice u must see an orange light in the center of the light switch itself to indicate that the tail fog bulb is on.

All the Euro specs. Mercedes has only one tail fog bulb, some ppl install the blank area on the tail light with additional tail fog bulb and some of them connect them with the break light but anyway it's not recommended.

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Master Computer Engineer, A+, Network+, MCP/MCSA/MCSE 4/2k/2k3 - Messaging, MCTS, MCITP, MCT, Brainbench, ICDL and starting Ph.D

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560SEC 1989 <------ Sold
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If you do want to illunimate those spots, its easy to do. Go to a wrecking yard and find a broken tail light assembly and get two sockets that match your existing.

Detach any wire for the rear fog light.

Install and wire to your existing brake light wire in each housing. Pop in a bulb and you have extra illuminated brake lights.

Haasman

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'03 E320 Wagon-Sold
'95 E320 Wagon-Went to Ex
'93 190E 2.6-Wrecked
'91 300E-Went to Ex
'65 911 Coupe (#302580)

I did see that i have the Orange dot on my light switch and it does pull out twice. I opened the lights up again and only saw a place for the bulbs but no electrical connection =(. I guess I will just have to find another connection that will fit. I just want the bulb to light up when I want to and not every time I step on the brake.