Eric, your 220 is suffering from the same evil problem afflicting all 93-95 (up to 96?) MB engines: biodegradable wiring.
In an effort to be more 'green', MB (and others) decided to make a lot of plastic components more enviro-friendly during those years, a noble cause to be sure, but the engine heat caused the wiring to begin its return to dust a bit prematurely.
So, also welcome to the bad wiring harness club. Black tape will help little. Any movement of the harness will cause the insulation to crack all over, it might as well be made of pie crust.
Delaer repair is about $750, parts and labor.
1995 MB E320 Wagon
2001 BMW 530i
2007 MINI Cooper S (!)