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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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I had a similar battery drain and continual winning noise after shut down and it was the central locking continually cycling - my fix was to pull the circuit breaker. Now i have to manually lock the car but no battery drainage now.
 

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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.
My parents 1994 Audi 80 had the same its the central locking / alarm

lock the car by the passenger door
 
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