Question about 2001 Audi TT

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Audi tt quattro 180bhp2000 conv keeps looseing power

Hi hope you can help its driving us mad.audi tt quattro (180)cabriolet lost power in june so advised to have new battery which we did,went away for two weeks on return flat again eletric garage rechared battery saying it could be faulty battery . it has been into the garage twice with the same prob it seems to happen nearly every four weeks .after its has not been driven for two days. no one can seem to find out whats wrong nothing showing up on history, also the horn sound has changed to the sound of a noddy car!!! please help it has happened again to day thanks anne

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  • audisue Nov 22, 2008

    Exactly the same car/ same problem-lost count of the number of new batteries and the number of times car has been connected to diagnostic tester at garage- no fault shows up but still battery flattens if car is left for a couple of weeks without moving.

  • anniedix Nov 25, 2008

    thankyou for info we are going to look into this and will let you now how we get on.

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Faulty batteries are rare. Typically when battery won't stay charged an alternator is needed, but you can check for a current drain first. To do this you need an ammeter. Disconnect positive line of battery and connect the circuit "through" the ammeter instead. (DO NOT START THE CAR LIKE THIS!!!). Monitor current draw - as you do so, pull each fuse from fuse panel (left side of dash). Don't pull them all, but rather remove one at a time. When the ammeter shows minimal current drain you'll know which circuit is causing the draw. You can then disconnect individual loads on that curcuit until you find the culprit. Hopefully it's something easy like a light switch - but it could be more involved.

Posted on Nov 22, 2008

  • KishMe Nov 22, 2008

    Oh - and to be clear, old batteries do go bad - and there are a lot of old dead batteries out there. I haven't seen many faulty new batteries, so if you're having this problem on a new battery then you're probably going to need to do this troubleshooting. It's really worth a try - wouldn't take more than an hour for an average person to do . . . once you have the right ammeter. It should be able to show current draw up to about 10 amps in order to be useful here.

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