I have a 2002 audi quatro A4 V6. the battery goes dead overnight - not always, intermittent. new battery. something is drawing power. no check engine light on. under 100,000 miles on the car.

Unhook battery positive and install test light in between the post and the cable. if it has a draw it should come on dim. then unplug the fuses one at a time and when you pull the fuse and the light gose out thats the circut with the draw. then refer to what that fuse runs and correct the problem by inspecting that part and repairing as needed.