Do a search on wiring harness on this site and you will find tons of pictures and info. I just replaced ours on the 93 400E at 99,000 miles. If yours is original that's got to be a record.

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95 SL500 Smoke Silver, Parchment 64K
07 E350 4matic Station Wagon White 34K
02 E320 4Matic Silver/grey 80K
05 F150 Silver 44K