Has anyone added a brake light in the back window and if so where did you connect it?

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1983 300SD
200000miles

See this thread. I did it on my '85 300D; don't know how similar it is to your '83 300SD but it might give you some ideas. Post #9 in the thread has the pictures.

Jeremy

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"Buster" in the '95

Our all-Diesel family
1996 E300D (W210) . .338,000 miles Wife's car
2005 E320 CDI . . 113,000 miles My car
Santa Rosa population 176,762 (2022)
Total. . . . . . . . . . . . 627,762
"Oh lord won't you buy me a Mercedes Benz."
-- Janis Joplin, October 1, 1970

I added this upgrade to both my 240s some time ago.

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1985 Euro 240D 5 spd 140K
1979 240D 5 spd, 40K on engine rebuild
1994 Dodge/Cummins, 5 spd, 121K
1964 Allice Chalmers D15 tractor
2014 Kubota L3800 tractor
1964 VW bug

"Lifes too short to drive a boring car"

I have added LED style 3rd brak lights directy to the lines for the standard brake lights.

They did not pull nearly the amount of current that a regular bulb does.

No problems so far.

I was thinking of using a w201 3rd brake light unit, since the base of the light fixture is shallow compared to the w124, which is deeper. Once I figure out how to mount the base to the rear deck, installing the 3rd brake light is just like a factory installation for w201, w124 and w126.

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http://farm8.staticflickr.com/7271/7...144c3fc1dc.jpg

My 300D has one that was installed when I bought it. I would have tossed it, but it would leave a mark on the rear deck. It appears to be tied into the left brake light.