[W126 Coupe] Speedometers

[Josh Allen]

On 4/4/2010 11:15 PM, Dan Gardner wrote:

> Hi Folks

>

>    I have connect everyting after fitting the replacement 

> speedometer,the cluster is loosley fitted for testing,problem is I 

> cannot get the instruments to light up with the ignition on or off and 

> there isnt any buzzer sound,the fuse is fine as are the 

> bulbs/globes,this replacement does have a different part number 126 

> 542 1657 whereas my old one was 126 542 9201 I am just wondering if MB 

> changed the multi plug wiring pattern.

>

>                                                                             

>                        Kind Regards Dan Gardner  1986  560 SEC  (Euro 

> 220kw)

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Dan,

If you mean loosely fitted to be only loosely screwed together, that 
could be your problem.

The ground for the various gauges is through the back of them all, using 
the boards and the housing of the speedometer, if I remember correctly.
If you tighten the fasteners holding the speedometer in the cluster and 
things start working, that would be be both proof and a fix, as well as 
fairly simple.

I hope it's something as simple as this and not a difference in the 
wiring, since the harness is an absolute nuisance to rewire when it 
comes apart!

-Josh