Paracitic Battery drain

m4matthew

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Hi Guys,

1st Time using this forum so excuse me if I post this in the wrong place. I have tried all other means of fixing this problem so thought I'd see if this works.

I have a 2001 Audi A3 SE 1.9TDi Manual with 167k.

After fitting a new clutch to the cat this year and having the ERG valve cleaned the car ran like a dream and still does.


One day the car had a flat battery. The garage took the car and it turned out it was the battery draining the battery. This problem was fixed or so I thought.

Then it happened again I jumped it and it was fine. it then happened again. I jumped it off my GF car and sparks and smoke came form the jumpers, and the radio had a crack in the LCD display and it was dead.

I then had an MOT the car flew through apart form an AIRBAG light for the sensor in the passenger seat. which had got knocked years ago. The garage could not clear the fault as was the usual procedure.
The ended up having to get an Audi electrical specialist out.

There was no problem for nearly 2 months and the battery died again. sent it to the garage and they had it for a week and every mooring it started. They needles to say did not charge me. After another 2 weeks or so it did it again. They cant see a fault or identify a drain on it with out getting an Audi Electrical spiciest out again and I'm reluctant due to the cars age and the amount I'e shelled out on it this year. It runs great and has no rattles and as a rolling chassis it is great. I now get around the drain by unhooking the battery, which is fine but just awkward. Especially in this rain and wind.

I constantly fear that the car will not start, a mechanic friend suggested the drain could be a celluloid in the "Internals (lights windows, AC, Radio, ECU) but don't know how to test. Any help and advice would be much appreciated as I'd hate to see this car go I love it.
 
Do you have a multimeter?
 
I had this recently and it was a couple of things, firstly it was the internals of the alternator, one of the diodes had gone, so it was reverse draining, so whilst the car was running it was fine, but once off, it drained, so I replaced the alternator and thought the issue was sorted, but then the battery was dead again, i think this was identified by checking the black cable in the fuse box on top of the battery.
 
Connect the multimeter in series to the battery ground and measure the current draw in milliamps.
Anything over 150mA is on the high side.

You can then pull fuses out one by one to identify the circuit causing the problem.
 
Hi Matthew ,
Had a similar problem with my S3 when i first bought it three years ago , the lads at work did a multimeter test for me and confirmed the current draw was excessive after locking the car . From memory you also need to trip the bonnet latch into making the car think its closed too . Anyway my parasitic drain was the radio , solved it temporarily by pulling the radio fuse , untill i replaced the head unit and all was then good . Maybe worth checking mate .
 

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