Hi, I am new here!!! I have looked all over for the answer to this problem, to no avail. I am not a professionl mechanic, but I am pretty handy. My 2001 SLK20 has a battery drain issue. I have done EVERYTHING that people suggest, hooking up a multimeter to the negative terminal, and to the cable, then pulling fuses. I even did the light thing where I could see the light if it went out when pulling a fuse. I pulled every fuse from under the hood, and on the drivers side to the left of steering wheel.......but the light never went out, so there is still a drain somewhere. One place said there was a fuse box in the trunk, but my 2001 doesnt have one.........I looked and looked.......I have had the battery checked and it is good.....but it drains in about a day and a half.......anyone have any ideas?? Thank you in advance....this forum is awesome!!! Woody