[W126 Coupe] Light Problem

[Mister McGoo]

If you have a european model 1983, the bulbs are H4's.  pop the back from the offending light plug and have your mechanic check continuity from the brown wire pin (socket) to a known ground, like the engine or whatever.   Make sure the socket of the plug for the ground (brown) wire is clean as that plug connection can be a problem.  If the ground wire is the problem somewhere else in the system it may be easiest to splice in another ground wire at the bulb plug and connect it to another ground, perhaps on the ABS assembly or whatever is handy (and fairly inconspicuous).  A mechanic should be able to check this in a few minutes.  - Bellamy
 

> From: calvinyoung at cox.net

> To: mbcoupes at mbcoupes.com

> Date: Sat, 19 Feb 2011 14:13:45 -0500

> Subject: [W126 Coupe] Light Problem

> 

> Thanks Guys,

> 

> I did switch the bulbs and that did not correct the problem. The mechanic 

> switched entire light assembly (driver light to passenger and vice versa) 

> and that still not correct the problem. So, the first place to look is the 

> ground wire. I checked, but will replace the fuse.

> 

> Second, this car is a euro and has the complicated light system that allows 

> one to switch on the parking lights on either side of the car. Lots of 

> places in Europe have narrow streets, so they have this unique system that 

> allows you to switch on the parking and front turn signal lights 

> independently of each other, depending on which side of the street you are 

> parked on. This switch, being made in 83 just might have developed a 

> problem. First, I will replace the ground and see what that does. I might 

> just rewire the darn thing to have the light work like American lights since 

> this particular feature is not needed.

> 

> I will keep you guys informed.

> 

> Cal

> ----

> > Cal,

> > If the problem is not a maginal fuse, you have a poor ground from that 

> > light. -Bellamy

> >>

> > First, check the fuse to make sure it's making proper contact.

> >

> > Second, have you tried replacing the bulb?

> >

> > Third, if the bulb is OK, you may want to get a multimeter and measure 

> > voltage at the connector at the back of the headlight. At the same time, 

> > check the connector (make and female sides) for signs of corrosion or 

> > other crud and clean with a wire brush if you find anything.

> >

> > Fourth, check your battery terminals to make sure they are clear and not 

> > causing any issues with poor or intermittent contact. Measure your 

> > battery voltage with the car both running and off. Should be 12-13.5V 

> > ish.

> >

> > Fifth, check your ground point behind and below the headlight (typically 

> > brown wires going to a single screw) to make sure that it's making proper 

> > contact and there is no corrosion there.

> >

> > Let us know what you find. One of these solutions should identify the 

> > problem. If it doesn't, then you may have another issue like a voltage 

> > regulator or even an alternator not generating the proper output, but 

> > that's a more serious bridge to cross if everything else checks out OK.

> >

> > Cheers,

> > Gerry

> >

> > Hi Cal,

> >

> > Most likely a poor ground connection,

> >

> > Carl Hansen

> > 

> 

> 

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