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Have an Audi 80 92 20E. Serious battery drain.after turning off engine 30 minutes tnanos battery drained.won't start.starts fine with jumper.have been taking off negative lead after turning off.this works but major headache.main components check out ok starter etc.after turning off a noise (humming)can be head at back of engine around two circular parts one has a blue cap on top!any ideas.?the noise stops when negative terminal disconnected!thanks.
 
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