Hello, i have a 2001 s3 audi, Last wkd i noticed the battery was semi flat and it didnt start my s3, i jumped the car with someone elses and it drove 50 miles without fault however as soon as i turned car off and tried to restart it, the battery was nearly flat. I got the audi jumped again and drove home. Next day i got a new battery and car started fine. Yesterday i drove car again and as soon as i turned off car and tried to restart it, nothing this time!. The engine doesnt turn over, doesnt click either on turnover, all the electrics work though. I tried to bump start it but theres no clicking sound from starting motor so it didnt start. I am used to working on cars but not a audi s3 lol. Anyone got any ideas as to where i should start looking for a fault?. I did notice a burning smell under the bonnet so im expecting a big bill but id like to try afew basics just in case its nothing massive. Help please!.