[Vwdiesel] Temp Gage

[The President]

William
AFAIK the voltage stabilizer is to maintain a voltage of say 10 volts across 
the instruments irrespective of whether you like to run your alternator at 
12.5 v or 15v... I guess you don't want the gauges going up and down 
proportional to the rpm of the car. Circuitry for the Dasher Quantum Rabbit 
Jetta series up to about mid '88  +GTD /cabriolet t o '92.... are 
essentially the same. That said there are between 5 and 10 variations due to 
'progress' luxury options etc over the period.
There is some 'computerisation' somewhere as the car goes through a series 
of checks/flashing lights when first started. Just a novelty I believe  but 
I've not looked into ripping it out and doing direct links to sender from 
indicator.

Mark


>From: "William J Toensing" <toensing at wildblue.net>
>To: <vwdiesel at vwfans.com>
>Subject: [Vwdiesel] Temp Gage
>Date: Fri, 20 Jul 2007 01:00:42 -0700
>
>Not sure if wiring & instrumentation on the Rabbit are similar to the 
>Dasher, but suspect they are. Working on my Dasher a year ago, I was 
>fishing a wire back of the instrument cluster to install an extra water 
>temperature gage in an auxiliary instrument cluster for an oil pressure 
>gage & voltmeter, as there was room for an extra gage. After installing it, 
>the fuel gage & temperature gage failed to work. I felt I had dislodged a 
>wire while working back there. Then a couple of months ago while working on 
>the Dasher, I studied the Bentley manual on how to remove the instrument 
>cluster & what might cause gage failure. I don't recall whether it was a 
>tip from this blog or trouble shooting suggestions in the Bentley, but one 
>suggestion suggested the "Voltage Stabilizer" might be at fault.I pulled 
>the instrument cluster from my '80 Dasher parts car, found its printed 
>circuit board to broken & wires soldered into it. I also took the voltage 
>stabilizer out of it, replaced it into my
>  '81s cluster & vola, the water & fuel gage worked again. I bought a 
>couple of extra "voltage stabilizers" as spares since they may be some of 
>the weak spots with VW Dasher diesels. Haven't worked on the Rabbit 
>instrument cluster but suspect it might have a voltage stabilizer too. By 
>the way, what is the function of the voltage stabilizer? It is small & 
>looks like it might have a transistor or diode in it. Let us know if this 
>or something else is the cause of the instrument failure.
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