Question about 2002 Audi TT
I have changed my battery twice due to the car not starting - but the problem persists. However while driving with my lights on - there is no loss of power.
You may have a current draw. it means when ignition is off someload drainning the battery. to check this disconnect the negative and with ign off install an ampmeter between battery terminal and post. it shoul not read more than 0.4 amp. if it does you have a draw. rate me. good luck
Posted on Jan 29, 2009
Two strong possibilities:
One is that the alternator isn't charging the battery. Stick a voltmeter across the battery while the engine is running. If it's showing less than 13-and-a-bit volts, you need to get your alternator seen to. (try this shortly after you've started the engine, and be careful not to rev the engine before taking your meadurement - there are some interesting alternator faults where it won't kick in until it's been spun at speeds above idle, but then appears to work perfectly)
The other is that something isn't switching off properly and is flattening the battery while it is parked. I once had a courtesy light hidden away in a glove box that got stuck on and caused me grief for weeks before I finally spotted it one dark night. You might try disconnecting the battery negative (with the engine stopped) and putting a multimeter on "amps" between the removed negative and it's terminal. View anything over (say) 100 mA with suspicion. You could then try to narrow it down by pulling fuses to see what makes the current go away.
Posted on Jan 29, 2009
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Posted on Jan 02, 2017
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