[s-cars] Battery update, C4 A6

[syljay]

An intermittant condition will frustrate any diagnostics.

My 88 5kq had an intermittant interior light module problem and/or 
broken/shorted door switch wiring. The lights would either not go off 
after the required delay(30 seconds), or the lights would go on by 
themselves in the middle of the night.

In addition to the current(milliamps) tests, remove the interior light 
module and leave it out for a month and see what happens with the battery.

SJ in NJ

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From: Huw Powell <audi at humanspeakers.com>
Subject: Re: [s-cars] Battery update, C4 A6

I would add to #3 (and put it "first") "Don't even put the key in the
ignition.  Do this with all the doors shut and timered interior lights
off.  Don't open any doors or the trunk with the meter in the circuit."

As far as an acceptable drain, 50 mA or so ought to run the clocks and
memory in the radio.  Some have suggested a bit higher is acceptable.

We could determine this if someone with a "healthy" car makes the
mesurement, or even on an "unhealthy" car, the tester could remove the
fuse that powers the clock and radio and see how much the current drops
(of course, if the gremlin is on this circuit, this won't tell us 
anything).

Oh, and the alternative to the DVM in #2 (etc.) is to use a light bulb,
and watch for its brightness to drop when loads are removed.

-- Huw Powell http://www.humanspeakers.com/audi 
http://www.humanthoughts.org/