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#1
05-17-2008, 11:19 PM
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Bosch Euroheadlight
Hello...
I just got a pair of bosch euroheadlights for 123 chasis that I wanted to install into my new to me 1985 300D. I would appreciate diagram of the 5-pin connectors. I have installed Bosch euros for 126 chasis but 123 seem somewhat different(?). I used the same 126 diagram on W123 but it wouldnt light up... Thanks
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1987 300SDL 314K mi, counting; #22 Head  1999 E300Turbo 405K original miles 1997 E320 180K mi (Son's) 2002 ML320 (Son's) 1998 S320 140K mi (Son's) sold 1985 300SD 311K mi 1984 300D 324K mi (killed by a hit-n-run turd) ************************************* 
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#2
05-18-2008, 02:33 PM
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I went through this for a W201 a little while ago and was also scratching my head. It dawned on me that the wiring is set up with a common ground for the bulbs in the main assembly. First figure out which pin that is.
The marker light should have its own signal wire and ground (and won't care which one is which). Once you know which one is ground (eyeball it), the others, by trial and error should be the low beam, high beam and city light. If you're testing with a live wire, make sure you've got a small fuse inline with it. It's better to melt the fuse than melt the wire or its insulation. -CTH
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#3
05-19-2008, 10:30 AM
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Euroheadlightlight Installation and schematic connection - W123
Thanks CTH...
I am not sure I got what you just explained. I may not have versed my questions clearly. Here is what I am trying to say... I am looking for schematics pin #1 empty #2 brown/brown #3 city light(any color since its optional) #4 white #5 yellow #6 grey/green stripe This is the schematic connection I used on 126. My question is... is this schematics the same on 123 chasis. Help please! Thanks
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1987 300SDL 314K mi, counting; #22 Head 1999 E300Turbo 405K original miles 1997 E320 180K mi (Son's) 2002 ML320 (Son's) 1998 S320 140K mi (Son's) sold 1985 300SD 311K mi 1984 300D 324K mi (killed by a hit-n-run turd) *************************************
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#4
05-19-2008, 04:58 PM
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You can figure this out yourself by looking inside and notinging out where the wires go.
In any case, for ALL German vehicles ... Yellow is low beam headlight White is high beam headlight Brown (earth) is ground Something gray is the park light.
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Kent Christensen Albuquerque '07 GL320CDI, '10 CL550. '01 Porsche Boxster Two BMW motorcycles
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