1993 300CE should have the older style insulation on the wiring so no need to replace unless you're having problems.

The harnesses that are problematic are on the 1994 and 1995.
If you have the M104-24V with the KE-Jet you should be fine.

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http://i19.photobucket.com/albums/b1...c/GOWIDE-1.jpg
1971 280SL ROADSTER
1988 300CE TWIN TURBO WIDEBODY
1994 E320 CABRIOLET
1999 C43 AMG
2005 G55K AMG
2008 CLK63 AMG BLACK SERIES