Hi, please help. I have a Audi A4 ALT B6 2.0l 2004 model. Battery was dead so I jumped started the car but blew the ECU, Radio and light on headlamps. I have replaced all except the radio. I have unplugged the radio. I drove the car for a week and overnight the battery was dead, I jumped started the car again and the car started up but the minute I switch off the car it will not start at all. I hear the ignition click when I turn the key to start up car, I hear the petrol pump also. I have done the multi reading on the battery and alternator and it reads 13.87 when car is on. When car is off the reading on the battery is 10.47. It is a new battery and something is draining the battery. Can someone help with what will be the cause of the battery draining.