Although this may not be the fastest way, I had a similar problem with my 2002. What I did was remove one fuse at a time until the disharging stopped, which then identified the circuit with the problem. Turned out to be a pinched wire, which was easy to find once I knew where to look. Note that you only have to remove fuses with power across them when the ignition is in the off position. HTH
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1982 Mercedes-Benz 300CD
1982 Mercedes-Benz 240D - stick
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