Thanks for all the inputs.
I have only one Merc now. It's the 1989 300CE in my signature. The others are history :-).
Of the loose, disconnected and cut wires I see only an antenna cable, a power supply wire and 8 cut wires. I will try to make picture of them to get more concrete hints.

Later!

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1996 E320 since 1/16/08, 171K miles as of Feb 2011

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1989 300CE - R.I.P. Dec 29 2007
Other MBs (sold): 1992 300E-24 - 1979 350SLC - 1984 230E - 1990 300CE