[W126 Coupe] Strange gauge lights error, any ideas?

[Dan Landiss]

Josh, the wiring behind the instrument panel is, uh, unconventional. 
Something about the speedometer case acting as a jumper to connect 
ground to the other half. I'd pull the cluster and manually trace both 
the hot and ground paths. Sometimes it is as simple as a loose screw 
causing poor contact to a circuit board trace.

on 2/25/2010 12:31 AM Josh Allen wrote:

> Markus,

> After testing today, it's sitting at 13.7-13.9 at idle, and 14.2 or so 

> at ~ 2k rpm.

> I was reading the same voltage indicated at the terminal block on the 

> fender, the battery positive terminal, and the B+ terminal on the 

> alternator.

>

> Looking in the charging system section of the ETM, I'm going to hook 

> my oscilloscope to the B+ terminal of the alternator and see if it has 

> an abnormal ripple, and failing that, I may just wander down to the 

> Napa and see what they can tell with their analyzer.  It's still under 

> warranty for most of another two years.

>

> The fuse on the top of the OVP was still good, I double checked, as 

> well as having the OVP apart to clean up it's pcb which had some nasty 

> flux residue or corrosion on the solder side of the board.

>

> (FYI: The alternator that is currently installed is PN:  RAY 2138381 

>    

> http://www.napaonline.com/Search/Detail.aspx?R=RSE2138381_0218228923  

> with a 72 month warranty.)

>

> -Josh


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