[W126 Coupe] Thanks for the diagram

[Dan Landiss]

It would help to know WHICH voltages are different. In the US wiring 
scheme, at least:

1) Yellow/black (at the left headlight) and yellow (at the right 
headlight) should both be near 12 VDC with the low beams on, zero if off.

2) White/black (left) and white (right) should similarly be about 12 VDC 
with the high beams on, zero if off.

3) All brown wires should be near zero no matter what lights are on or off.

None of the voltages are ever negative unless the black (negative) 
voltmeter lead is attached to a reference that is not really grounded -- 
and that could be the cause of the whole kerpuffle.

on 2/28/2011 10:04 AM Mister McGoo wrote:

> Whoa!  OK, you're giving some additional information here.  Looks like 

> someone has been "working" on this electrical system before... some 

> lights working, some poorly and some not at all..... and on both 

> sides.   "/The voltage on the passenger side of the car are different 

> than those on the driver's side. " / How can the voltage be 

> "different"?  Adding a new ground to a light shouldn't cause the light 

> to not work (unless now you have no ground at all).  Something else is 

> happening here.  Could be indeed that you need a complete new 

> (european) light switch.

> -Bellamy

>

>

> ------------------------------------------------------------------------

> From: calvinyoung at cox.net

> To: mbcoupes at mbcoupes.com

> Date: Mon, 28 Feb 2011 10:30:06 -0500

> Subject: [W126 Coupe] Thanks for the diagram

>

> Thanks for the diagram, it came through fine.  I will appreciate some 

> help in reading it.  Is there someone I can call?

> I was trained in electronics, but auto wiring diagrams follow their 

> own convention that I always have found somewhat confusing.  This will 

> be a challenge as I have a euro and the light switch is very 

> different.  Fortunately, that part of the operation is working fine.  

> The euro cars can _independently_ turn on the left or right side of 

> the  parking lights,  This is working fine even though I find no 

> reason ever to use this feature.

> There are some strange things going on in this car.  The voltage on 

> the passenger side of the car are different than those on the driver's 

> side.  The passenger side fog light works after I fooled around and 

> then stopped working.  The fog lights on the drivers side has not 

> worked so far.

> I put on a second gound to the passenger light and the light stopped 

> working entirely.

> The voltages are negative as well.  Very strange.

> Cal

> Message: 14

> Date: Sun, 27 Feb 2011 21:44:36 -0600

> From: Dan Landiss <dan at landiss.com>

> Subject: Re: [W126 Coupe] rewiring the lights on my 83 380SEC Euro

> To: Mercedes Coupes Mailing Lists <mbcoupes at mbcoupes.com>

> Cc: calvin young <calvinyoung at cox.net>

> Message-ID: <4D6B1A24.7050600 at landiss.com>

> Content-Type: text/plain; charset="iso-8859-1"; Format="flowed"

> This may be a blind alley since it may only cover the North American

> models -- but see if the attached schematic helps. (LIST: this is a

> 220KB file so it might not make it to the list, but Calvin should get

> his copy.)

> on 2/27/2011 6:47 PM calvin young wrote:

> > Hi Guys,

> > I need to rewire the passenger head light on the 83 380 EURO SEC.

>

> The MB Coupes Website! W126 SEC Mailing List Postings remain property 

> of MB Coupes, L.L.C.

>

>

> The MB Coupes Website!

> W126 SEC Mailing List

> Postings remain property of MB Coupes, L.L.C.


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