Had the identical problem with my '94 SL500, battery dead in 3 days, replaced the battery twice, bought an inline current tester/ammeter, removed every fuse in the car, front fuses, , disconnected the trunk cd player. Removed every interior light bulb, crawled in the trunk at night, removed fuses in the dark looking for a spark, with everything removed and disconnected, i still had a 300 milliamp draw. Took it to an independent electrical shop who indicated it might be a problem with the ignition switch, alleged technical memorandum on this. 5 hours later no diagnosis, would need at least 5 hours more to diagnose. Took it to the dealer, they stated at least 8 hours @$95/hr. Solution: Bought a priority start for $75.00 took 20 minutes to install, memeorized the radio code and I really no longer care where the source of the current leak is. It's a 10 year old car with 22,000 miles. I am not a wealthy man and was not going to spend thousands trying to repair something when $75.00 gives the same result, problem solved.

'91 560 SEL 88,000
'94 SL500 22,000
'86 300SDL 202,000 burnt to a crisp!

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jcciem
'94 SL5000 60,000
'91 350SDL 545,000
'91 350SD 197,000
'00 E55 AMG 77,000