[urq] sudden stumbling (RESOLVED!)
i.rautenberg at waratap.com
Sat Jul 1 17:38:09 EDT 2006
I'm guessing he has the ABT /taxi gauge pod like I had on my '83 that
extends to the right of the Instrument cluster. Then it all depends
on how the gauge was wired up.
On Jul 1, 2006, at 4:06 PM, urq wrote:
> Congrats on the find! Are you also saying that the stumble is
> fixed? If so
> it would be interesting, but not really surprising, knowing that
> the ECU is
> sensitive to low voltage.
> What sort of voltmeter do you have? I don't think the urq ever had a
> voltmeter. If it is wired per the factory wiring like my old Audi
> Fox, the
> problem is that the voltmeter is wired into the same circuits that
> power the
> cabin blower fan. When the blower was set to full speed the
> voltmeter would
> read less than 10 volts! Of course the battery voltage was never
> that low. What I found was that the real culprit on the voltage
> drop was
> the ground. The current from the fan through the ground wire
> created a
> voolt or more of drop. Since the same ground is the reference for
> the other
> gauges, they would also give faulty readings. If you find
> something like
> this, create a direct connection from the gauges to ground. The
> +12 supply
> is a bit more difficult ... you need to find a circuit that is
> (don't want the meter to wear down the battery after all!) but has
> very low
> voltage drop from the source. I suppose if you wanted to know
> what the battery voltage was you could dedicate a relay to switch
> the supply
> to the meter on and off with the ignition ...
> Steve B
> San Jose, CA (USA)
>> Well, I think I have it all licked. Turns out most of the problem
>> was a
>> bad exciter wire D+ on the alternator. I had to run a new from the
>> instrument cluster (pin 12-2). The motor runs like a champ now. New
>> plugs didn't hurt either. I am getting 13.8v at the alternator
>> post and
>> 13.6v at the fuse box. Now to figure out why the gauge that reads
>> voltage in my dash somewhere, reads a full volt low. I also still
>> to inspect my splice joint. Thanks for all the help guys.
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