Ok I have a C270 CDI and a few weeks ago I had a flat battery in the morning. Got it started and drove to work. Over the next two weeks I check the battery drain and it's been 0.04 amps. Then today same again flat. Had about an hour to check it out and found a drain of 5 amps. Pulled a few fuses but as I was pushed for time drove to work and got our auto electrian to look at it. You guessed it back to 0.04 amps. All day starting it stopping it measuring it and no drain. With a drain that big I would think alternator or glow plug relay. Can a alternator be intermitant ? Any other thoughts ? By the way I have part electric seats and the constant live on the plugs don't go anywhere although the seats are heated