[W126 Coupe] dim passenger light

[Dick Spellman]

Cal,

This may help as a further clarification re: US (NA) vs. Euro switch and 
model year differences.  The early light switch is different than the 
later models in that the harness is soldered directly to the switch 
terminals in early model years.  The later model years employed a 
plug/pin harness making switch replacement easy.

The only added feature to either switch type was on the euro.  This had 
a single +12VDC wire lead that was activated on the second pull of the 
fog lamp function.  The first pull illuminated the front fogs on both 
euro and NA models.  The second pull worked only on euro models and lit 
the rear single fog lamp and lit up the center (orange) indicator lamp 
on the switch handle.

As for the ongoing dim light issue, why not disconnect the ground lead 
temporarily at the lamp socket and hot wire a new ground to chassis to  
see if this in fact gives the lamp full bright function?

-\DIck



On 3/4/2011 8:39 AM, Steve Nervig wrote:

> Cal, this still just seems to me that you have a bad ground wire somewhere. I haven't followed your troubleshooting closely, so please excuse me if you have already double checked all continuities, from all grounds and thru all pins in the light housing? Probably not the problem, but have you REPLACED all fuses (not just checked them)?

>

> I do not think that the Euro switch would be any different than the NA switch (but I don't know for sure). Both should have the Standing Light positions (controlled left or right parking lights) - which shouldn't be playing any part in your problem.

>

> The "pullout" portion of the switch merely activates the fog lights. There should be two detents in the pullout - the first detent turns on the front fog lights, the second (all the way out) turns on the rear foglight (which could be either the left, right or both rear fog lights, depending on which country the car was built for - most countries have just the one driver's side rear foglight).

>

> Regards,

> Steve

>

>

>

>

>

>

> On Mar 4, 2011, at 5:14 AM, calvin young wrote:

>

>> Dan

>> Guys,

>>

>> I cannot think for the life of me what would be causing those odd voltages.  I cannot see any relays in the lighting circuit, I cannot imagine that the switch would be causing this.  Mice did get into the car at some point and perhaps they have shorted something out, but I have looked and could not find any chewed wires.

>>

>> My next strategy is to trace the wires from the lights back to the sources and replace them if necessary and see if that does any good.  Atl least I know the lights themselves are not a problem as I switched them with each other.

>>

>> One question.  Do you know how that Euro car light switch is supposed to work?  Specifically, the switch pulls out and turns, but that does not seem to make any difference in the operation of the lights, so I wonder what was it supposed to do.

>>

>> Another thing, all the circuits in this car, the lights, door switches, horn, security system, etc. are all tied together in some way.  I might just try taking all of the fuses for everything but the lights and see what that does.  What do you think.

>>

>> Cal

>>

>>

>> Voltages are:

>>

>>                  left hand    right hand

>>

>> white         12.50          0.23

>> yellow         0.53          5.50

>> brown         0.23           5.55

>>

>>

>> voltages at the fuse seem to be correct.  They are:

>>

>> F2 high beam right 14.01

>> F4 high beam left   14.02

>> F6 low beam right    0.53

>> F8 low beam left      0.56

>>

>>

>

>

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