bypassing mb fiber optics system
So, even with your current situation of having all the wires in a jumble in your trunk, I'd try having the headunit checked out. It could be as simple as a software issue. Otherwise, you may be able to find a replacement unit on ebay pretty cheap.
If your car uses a MOST fiber optic system, theres no easy/cheap solution to use the factory amplifier with an aftermarket headunit. It's not even worth it really.
Depending on which dash you have, going with an aftermarket headunit won't be such an easy task either.
Did you cut the connectors off of all the plugs in the trunk?
This part might help you.
http://www.ebay.com/itm/MERCEDES-BEN...24eaa1&vxp=mtr
Problem is, most all aftermarket stereos have only 4 hi-level outputs, while your car probably has about a dozen speakers throughout the cabin. Also, I don't know about your specific car, but alot of Mercs run 2ohm speakers in several places throughout the car, a load most headunits aren't rated to handle from their hi-level outputs. Minimum is usually 4 ohm.
If you want to simplify it, buy a set of front and rear speakers and run power only to those speakers from an aftermarket headunit. Or go all out and start buying amps, speakers, subs, and have yourself one heck of a real sound system.
BTW, I mentioned finding a replacement used headunit on ebay. I realize a new OEM unit would be astronomical.









