This may help you with getting V12 only parts cheap.

http://www.benzworld.org/forums/sale-wanted-trade-giveaway/1566146-parting-out-1995-s600.html

Since you say the harness looks good, I'm going to guess ignition module now.

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1985 500SL Euro w/ AMG bits 130k
1984 300SD Turbodiesel 192k
1980 240D Stick China 188k
2001 CLK55 AMG 101k
2007 S600 Biturbo 149k Overheated Project, IT'S ALIVE!!!