If you have the center fader that splits 2 head unit signals between 4 speakers, there is an easy way to bypass the fader and access all 4 speakers without re-wiring. It is discussed at http://www.peachparts.com/shopforum/showthread.php?threadid=18778&highlight=fader . Also, the old fader switch can be modified into a custom input jack for an AUX in if your new head unit has that feature, allowing a portable cassette, minidisk, or MP3 player to be played throught the head unit.

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John

2003 Firemist Red/grey leather SL 500
2015 Palladium Silver/black mbtex GLK 350
1987 Smoke Silver/burgundy mbtex 300E Sportline (SOLD)

Click to see 87 300E