[W126 Coupe] Strange instrument cluster behavior

[Dick Spellman]

Not sure Marcus.  It's out of the ordinary.  Check the connections again 
then reconnect the car battery.  Check the over voltage protection relay 
fuse although I don't know that it is related to the problem you describe.

Dick

Markus Meyer wrote:

> Toasted the cluster you say - which part - just the speedo pod?  I 

> found it strange that when I first swapped out only that one pod with 

> oil/temp/gas/vacuum with a known working one, it also acted funny.  

> Then when I put the other complete cluster from the 560 in which was 

> known to be working, everything worked fine (except of course tach and 

> speedo are off).  I may try putting a good known working speedo 

> cluster into my original cluster to reuse the "4 pod" and tach pod to 

> see if they are okay.  I'm just surprised I would have fried the 

> speedo pod and nothing else, but so far thats what it looks like.  

> Guess with that damned clock not working I "forgot" that wire was hot 

> dammit...I tested all the connections several times and looked for 

> fried wires and the such before putting that complete known good 

> cluster in and found nothing obvious, and no fuses blown, etc.

>

> Markus Meyer

> m fm at meyerprobateproperties.com <mailto:mfm at meyerprobateproperties.com>

> www.meyerprobateproperties.com <http://www.meyerprobateproperties.com/>

> Meyer Probate & Properties, LLC

> 484-919-9762

>

>

>     -------- Original Message --------

>     Subject: Re: [W126 Coupe] Strange instrument cluster behavior

>     From: Dick Spellman <spell.yy at verizon.net>

>     Date: Sat, September 15, 2007 8:13 pm

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

>

>     Whew. Marcus. That wire you pulled off of the lug on the clock module

>     is 12 volts hot at all times. The spark you describe would have been

>     making contact with the cluster backing which is a ground path. So

>     that's a dead short brief as it may have been.

>

>     I'd go over everything one more time and see that the connections are

>     correct. And be careful with that hot 12VDC lead. You may have

>     toasted

>     the cluster, not sure.

>

>     Dick

>

>     Markus Meyer wrote:

>     > Hi guys,

>     >

>     > I have a question about the instrument cluster. I was taking the

>     > cluster out to see about painting the needles. When taking the wire

>     > off the clock it sparked because as I pulled it off I guess it

>     touched

>     > to the pin again. Anyhow, after putting it all back together, the

>     > temperature/gas gauges were maxed out and the oil pressure was

>     > minimized. And the dash lights would go out when I started the car,

>     > go back on when I shut the car off.

>     >

>     > Now this is what gets weird. I then installed a known good working

>     > cluster from another car. Everything worked fine. So now I was

>     > totally confused. So I then swapped just the speedo pod from the

>     > original cluster to the second cluster where everything worked.

>     > Again, the strange behavior! Put the second speedo pod back in the

>     > second cluster, everything fine.

>     >

>     > So....what happened? Why would the speedo cluster cause the

>     > temp/gas/oil pressure/vacuum cluster to act funny? Is there a

>     fuse I

>     > blew somewhere I can' t find/see.

>     >

>     > And I can't just use this second cluster as is because one is

>     for a 6

>     > cylinder and the other is for an 8 cylinder and the speedos and

>     tachs

>     > are calibrated differently. I just want to make sure I didn't mess

>     > something else up somewhere I'm not aware of...

>     >

>     > Thanks,

>     >

>     > Markus Meyer

>     > mfm at meyerprobateproperties.com

>     <http://email.secureserver.net/pcompose.php?aEmlPart=0&type=reply&folder=INBOX&uid=2206#Compose>

>     <mailto:mfm at meyerprobateproperties.com

>     <http://email.secureserver.net/pcompose.php?aEmlPart=0&type=reply&folder=INBOX&uid=2206#Compose>>

>     > www.meyerp robateproperties.com

>     <http://www.meyerprobateproperties.com/>

>     <http://www.meyerprobateproperties.com/>

>     > Meyer Probate & Properties, LLC

>     > 484-919-9762

>     >

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