Voltage drop reading on guage '83 Coupe

[David]

Huw,

You say it is normal only on cars with under dash fuse box, but my car (87.5 CGT) behaves in in similar manner. Accessorires cause it to show lower voltage (although seldom below 12V, unless I have headlights, stereo system, wipers and cigarette lighter all at once). And the cigarette lighter causes the oil temp gauge to jump up about 28*C, also the fan on high cause the oil temp to jump about 15*C. Screwey Audi wiring...

Dave
87.5 CGT
SE Virginia
----- Original Message ----- 
From: "Huw Powell" <audi at humanspeakers.com>
To: "Ben Swann" <benswann at comcast.net>
Cc: <quattro at audifans.com>
Sent: Thursday, February 05, 2004 2:09 PM
Subject: Re: Voltage drop reading on guage '83 Coupe


>
> > Is it normal for the voltage reading on guage to read about 1-2V
> > lower than battery voltage when accessories are turned on, in
> > particular the climate control fan?    This car registers
> > significantly lower on the voltmeter than at the battery.
>
> Yes, it's normal.  My '82 reads about 6v with each cycle of the turn
> signal.  The gauge is wired "after" a lot of high current devices and
> they tend to cause a voltage drop on that circuit.  Heck, my cigarette
> lighter used to wreak havoc with all 3 gauges, since it raised the
> ground it was attached to.
>
> This only applies to the cars with the underdash "fusebox."
>
> -- 
> Huw Powell
>
> http://www.humanspeakers.com/audi
>
> http://www.humanthoughts.org/
>

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Dave
2002 Jetta 1.8T (hers)
1993 RX-7 R1 (weekend play toy, soon to be for sale)
1987 CGT Special Build 2.3
in Virginia Beach, VA.