Parasitic Battery Drain Measured on 1990 Audi 100

[Huw Powell]

It might be the design, though it seems a bit odd.  The thing is, the 
power seat function is "battery powered" because you aren't supposed to 
use it while driving (does the memory function even work when the car is 
running?).

A 250 mA draw wouldn't be a big deal on a new car driven every day.  No 
car designer takes regular two week down times into account.

If it will continue in this sporadic use, I see no problem with a 
"custom" solution as I mentioned before.  This could be a FUSED ON THE 
HOT SIDE switch wired to those fuse contacts, or a FUSED jumper from an 
"ignition on" source to the non-hot side of the fuse contact, or even 
just leaving the fuse out and installing it occasionally if necessary.

Oh, and your final mA draw with all devices defused could just be the 
combined flow through dirt and corrosion at the battery, starter, 
alternator, etc. (anything connected directly to the battery).

- Huw

On 7/21/2015 7:34 PM, mboucher70 hotmail.com wrote:
> After 14 days the battery was down to 11.5 volts, but it started just
> fine. Turned over a bit slower but started right away.  Needless to say
> not an optimal situation.  I've removed the 30A fuse for the chair
> memory and charged the battery up.  Now it will have a 50mA parasitic
> drain remaining.
>
> Still can't help wondering if that's the design of the chair memory
> module, or did something in it go bad.  And if so, a diode? capacitor?
> just curious...
>
> -----Original Message----- From: PSD
> Sent: Tuesday, July 21, 2015 1:57 PM
> To: 'mboucher70 hotmail.com' ; quattro at audifans.com
> Subject: RE: Parasitic Battery Drain Measured on 1990 Audi 100
>
> Just curious, did the car start after 14 days?  That draw would kill the
> average battery pretty quick.
>
> -----Original Message-----
> From: quattro [mailto:quattro-bounces at audifans.com] On Behalf Of mboucher70
> hotmail.com
> Sent: Tuesday, July 21, 2015 12:16 AM
> To: quattro at audifans.com
> Subject: Parasitic Battery Drain Measured on 1990 Audi 100
>
>
> I've always noticed that my Audi's car battery ran down faster than other
> cars when the car hadn't been driven for a while.  Two weeks ago I did
> 1000km of highway driving then parked it and didn't drive it for 14 days.
> Yesterday after 14 days, I measured the voltage and it was down to about
> 11.5 volts.
>
>
> I decided to finally measure what the drain on the battery was, when the
> car
> is just sitting parked.  And further, to see what was actually responsible
> for that drain.  I did this by routing the battery through an ammeter.
> Results:  Total drain: just over 1/4 of an amp. 261 mA to be precise.
>
>
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