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  1. Although I've been a member here for a few years , having had a few VAG cars myself , these days it is mainly for knowledge relevant to the various VW cars run by family members . My daughter has had her Polo 9N for almost three years - it is a 52 reg 1.4 petrol automatic car . While the car generally runs well , it has had one ongoing problem , that the battery often runs down to dead flat . I used to largely blame this on the fact that my darling daughter hardly drives the car , tending to pinch her mum's new Mini whenever she can , rather than use her own petrol !! The upshot of this is the car can often sit for a month or longer between getting started , and then she might only go 5 or 10 miles in it ! There was only something like 340 miles between the last two MOTs . This is her first car and I've told her since she got it that she needs to use it more . However apart from this one issue the car hasn't given a moment's trouble . Anyway , with recent events , I've spent the last few weeks around the house more than normal , so I decided to give the car a bit of an overhaul ; I was aware the exhaust system was on its last legs and fitted a complete new system ; also conscious that the battery repeatedly being allowed to go flat wasn't a good thing , I treated her to a new 63Ah Bosch S5 battery , thinking that , along with a bit more regular use , might solve the problems . All was well for the first couple of weeks and she reported the car was going great . Pleased at this I felt it was money well spent . But then the other day , she told me she'd parked the car up on Wednesday , and on Friday it was dead flat again . She was going to get her step dad , who knows nothing about cars , to charge the battery , but I told her to leave it so that I could see for myself , and I went up the following morning ( last Saturday ) . As Gill had reported , even the remote central locking wasn't working and we had to open the car with the key ; there was no sign of lights having been left on , so I opened the bonnet and measured the battery voltage : zero ( and I have a decent Fluke auto ranging DMM which will register quite small voltages . Anyway , I had brought along another fully charged 100Ah battery out of my Mercedes 300SL , which i knew to be good , and jumped it off that , leaving the donor battery connected for a few minutes before attempting to start and also after it , to avoid too much of a drain on the alternator . We drove the car the 10 miles or so to my house and parked it up while I ran Gill back home and then did some shopping . Some two of tree hours later , I went back out and checked the voltage ( it had been showing 12.7 V when we parked it ) and was down to 5.1 V ; admittedly it had only had a 20 minute run , so would not have been anywhere near fully charged . I put the battery on a maintenance charger and left it overnight , looking at the indicator on the battery charger yesterday , it was showing 12.8V and still charging , so I left it to today , when it was showing 13.3 V - more like it . Anyway , I took the negative terminal off and put the meter in series , looking at current , when I reconnected through the meter , there was a loud clunk from somewhere below the windscreen , and the wipers jumped , and of course the alarm went off . However on cancelling the alarm , opening and shutting the door so the car wouldn't lock itself again , there was an initial reading of a little over 2A , before the car went into quiescent mode and the drain dropped to circa 0.15A which I didn't think too excessive . Pulling various fuses would reduce the current by 10mA here or there , but there were no huge consumers : once I figured that the fuse card referred to the box upside down , the two main draws were the dome light , which was off , fuse 28 ; and the cigar lighter , fuse 46 , I checked the lighter wasn't warm ( Gill is a non smoker so it is never used ) and left it out of the socket , just in case it was somehow drawing current . I checked for things like a light in the boot , and the glovebox , no problems there . With the battery reconnected , showing 12.7 V before starting , and rising to 14.4 V with the engine running , I'm fairly confident the alternator is working and charging fine . I did find this thread when looking for ideas , but couldn't see any other discussion re common problems . The poster on that thread apparently had a door lock replaced by the dealership under warranty . I'm now leaving the car overnight to see what happens . In the absence of any further ideas , all I can do it to try disconnecting various fuses until I see what might be the culprit ; oh , after reconnecting the battery , I discovered there is an auxiliary fusebox inside the lid on top of the battery , with about half a dozen fuses - I have no fuse map for these and no idea what they protect , but will try pulling each of them in turn tomorrow to see if the drain might be through one of them . I don't know if there are any known common faults on these cars which might cause the battery to drain . I now get the feeling this is something intermittent , either something like a door lock not fully latching , a wiper motor not fully parking , or water getting into something and causing a drain ( but haven't correlated these events to weather conditions yet ) , we did have heavy rain last week , so that is a possibility . Any thoughts or ideas would be appreciated . Thanks in anticipation .
  2. Wondering if anyone could help on this. I’ve recently bought a 9N3 GTI, it’s had a new battery fitted within the last month or so and it keeps going flat. I’ve taken the negative wire off and done a drain test, it’s draining at 4-4.5amp, so the battery goes flat in no time. Haven’t had the time to start pulling out fuses, but wondered if anyone else has had any similar issues? Any help would be appreciated. All lights are off, boot light is disconnected etc.
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