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If it has electrically operated seats disconnect them overnight . they are live all of the time, then see if the battery is ok the next day.
I have seen something online on how to disable the power supply (W203) once the car is parked. Small wiring change under each seat.
Good luck.
Pulling the fuse will work for fault finding but will render the seats immovable. The wiring change I was talking about kills power to the seats when the ignition is off thereby making any future power drain impossible.Should be a fuse for the seats that can just be pulled Pete.
Finding a battery drain is down to methodical elimination.
Malcolm (TV) took the time to trace my battery drain last year by printing off the fuse locations and then pulling them one by one and testing for a drain.
He told me a drain of up to 65ma is acceptable, over that and the one doing it is the problem. Mine was a faulty door controller.
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