battery drain

Mark R speedracer.mark at
Sun Apr 5 18:05:30 PDT 2009

You're doing it correctly.  Make sure your leads are in the fused sockets.
Next, you'll have to test on a circuit (or with another VOM -volt -ohm
-meter) that the fuse is good.  You may have blown it.

Do you have a 10 amp setting?  Try that first, then go down in scale for
more precision.  Also, make sure all lights are off and doors are closed.

If you got no reading, you have a bad lead, blown fuse, bad VOM, or aren't
using it correcly.  EVERY car has some battery current "drain" with
everything "off."

Rig up a simple 12V light bulb circuit and a battery to test your technique
with the meter.

Mark Rosenkrantz

On Sun, Apr 5, 2009 at 8:32 PM, Kent McLean <kentmclean at> wrote:

> To troubleshoot a battery drain, I charged up the battery in my
> '91 200 20V.  I reinstalled the battery. I attached the negative
> (ground) cable to the battery negative and left the positive cable
> free. I then attached my digital volt meter (DVM) probes between
> the battery positive and the positive cable, to see what the
> battery drain might be.  I tried all 3 m.amp settings (2000u,
> 200m, and 20m) and couldn't get a reading -- the DVM showed 0 on
> all 3 settings.
> Not being an EE, am I doing this right?
> Should I see a reading?
> Could I have burnt out the m.amp reading?
> I swapped the DVM probes for m.amps rather than the Ohms position
> they had been in.  The voltage part of the DVM still works.
> --
> Kent McLean
> 1999 A4 Avant, V6 Tiptronic
> 1991 200 TQA #3, with mods
> soon-to-be-mine 1990 V8 w/5-speed and other mods
> gone: '91 200 TQA x2, '94 100 S Avant, '89 200 TQ
> _______________________________________________
> quattro mailing list
> quattro at
> ---
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