Any 123 Radio Wiring Expertise?

[rkohut]

Purchased a Sony XPOD 410U CD receiver to replace the existing Kenwood KRC-860 cassette receiver in my '83 300D. Looks like the PO got the Kenwood for hookup into the car phone. For some reason the original MB speakers were replaced with no name JUNK, which is the real reason I've decided to replace the entire sound system. The new speakers are Polk Audio db 400 in front and Polk Audio db 525 rear.

Had to do a little corner trimming on the front speakers (easily with back and forth bending with vise-grips). The plastic dash speaker cover is a little snug on top of the center tweeter? but is not noticeable. Rear speakers went in easily after removing the plastic bellows which surrounded the original speakers.

When I removed the Kenwood I saw that whoever put it in did extensive rewiring. The normal blue, red and black wires are no problem but it's the yellow and orange which I can't figure out. The orange-white striped wire has a plastic marker which says DIMMER on one side and ILLUMI on the other.

That variable adjuster at the back of the shifter console would adjust the volume between front and back speakers. I can't figure out how it's tied in. Also I can't locate the rear speaker wires in this tangle. The color codes don't match and after I disconnected the battery I couldn't get a continuity check between any of these wires and the rear speakers.

Does anyone know where a radio wiring diagram is for the W123. I'd like to rip out all this crap out and rewire it.