I confirmed that indeed the gauge is stuck as high as it goes when the cluster is merely plugged in (no key in ignition, car obvi not running, etc) at all times.
I'm not totally sure what to look for other than brown wires that have "loose connections" and tighten them...and maybe bare wires too...
My electrical gremlin count is growing and I still haven't even found/fixed one...(ok, that's cuz I'm sort of avoiding them)
Good to know I can shoot for 130MPH ;) despite what the speedo says...but the one that goes higher was orig to the car and at least i have a spare for if/when I send out mine for repair.
Gonna go check the voltage regulator (as suggested) and also see if I can't rejuvenate my hazard switch in hopes of restoring signals (they light, inside and out, but don't blink). While after the hazard, I hope to check and dig around in the wiring behind the console in hopes of finding gremmies.
Caitlin
Santa Fe
--- In diesel_mercedes@yahoogroups.com, "Nate" <vwnate1@...> wrote:
>
>
> OBTW :
>
> The speedo stops @ 85 MPH but the _car_ will top 130 MPH once it's running well .
>
> -Nate
> Caitlin wrote:
> >
> > When I got Betty, I knew the odometer wasn't working. When I drove her home after picking her up, it was dark and torrential rain (not common in these dry parts) and so I discovered that the left half of the cluster was too dark to see and the left turn signal light was out.
> >
> > I've since noticed that the oil pressure gauge always reads the highest and never moves. The clock doesn't work (ok, who cares) and the tach jiggles. And the kicker is that the speedo only goes up to 85MPH (as in, that's the highest mark that's on the gauge face). All other warning lights seem to be just fine.
> >
> > Luckily the PO included what was theoretically the original cluster and today I dug into some troubleshooting and minor fixes after I performed my very first oil change. Ever. (Messy, but it feels good)
> >
> > Between the 2 clusters and some new bulbs I was able to
> >
> > * fix the missing lighting on the left side of the cluster
> > * fix the left turn signal light
> > * install the original speedo (also broken)
> > * used the "better" potentiometer until I can spring for a new one
> >
> > So the lights and bulbs are all working and I can see it at night...yay!
> >
> > Here's what's left...
> >
> > * speedometer definitely broken beyond my skills...the gears are broken (missing teeth etc)
> > * tach jiggle...gonna check the amp since it jiggled with both clusters
> > * oil pressure...also busted with both clusters, when plugged in both read 3 (highest)
> > * new potentiometer
> >
> > QUESTIONS:
> >
> > 1) Oil Pressure ... is my problem likely the oil pressure sensor? Is this the same as the Oil Pressure "switch"? Any other troubleshooting to do to really find the problem?
> >
> > 2) The speedo I took out, that only has markings for up to about 85MPH (140km) has a part number: 126 542 44 01 ... what car does this go to? I tried searching, no luck.
> >
> > 3) For speedometer fixing...who do you recommend? I requested a quote from speedometer.com
> >
> >
> > Thanks!
> > Caitlin
> > Santa Fe
> >
>
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