I would remove the battery first,

then measure the resistance of the car circuits both ways from the main cables that go on the battery (with the batttery removed),

then remove one by one the fuses and sort out which circuit is draining.

May be you simply one light which is permanently on, and try to find it.

Be carefull, If you do not know how to do it don't do it.

good luck

__________________
Keep us posted especially if your problem is solved
Present cars:
My car: E-class 420CDI, 2008, W211, V8, 180 000km

Wife's one: C-class 220CDI Sport Coupé, Euro, 2002, W203. 345 000km

Son's one: GLK class, 220CDI, 2009, W204

Sold: E-class 260E, 1988, W124, Wonderfull car sold after 489 000 kilometres of reliable services (engine M103, clutch, brake system and 5 speed manual gear box all original).

Sold: E-class, 320CDI, W210, 2000, 225 000km