Again, not an MB tech, but make sure you leave it hooked up for at least 5 minutes in case there are some "late bloomers" that don't turn on immediately upon re-connection of the battery. Granted, this is usually an issue for later model vehicles, but it won't hurt to be thorough.

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A.S.E Tech A1,A6,A7,A8 & MVAC 609 + EPA 608

Unless stated otherwise, any question I ask is about my greymarket 1985 380SEL.