Pulled out my CD-ROM on my '94 S500, and there's a wiring diagram with color-coded wires and tie points. The pics are not that clear AND it's in four separate shots. But the info is there! Even at that, it will still be a good challenge to get it back together.
The CD is the ALL-DATA/PM (only $19.95) and here's the link:
http://popularmechanics.com/popmech/shop/CDROMP.html