1990 300SE Radio Wiring Issue W126 | Mercedes-Benz Forum I have a 1990 300SE W126 Benz and I was HOPING that somebody has a wiring diagram for replacing the stock radio with an aftermarket stereo. I have been looking all over the net and cannot find anything useful. My radio has a plug on the back that only has maybe 4 1990 Mercedes 300SEL Car Stereo Wiring Diagram - ModifiedLife Whether your an expert Mercedes 300SEL mobile electronics installer, Mercedes 300SEL fanatic, or a novice Mercedes 300SEL enthusiast with a 1990 Mercedes 300SEL, a car stereo wiring diagram can save yourself a lot of time. Automotive wiring in a 1990 Mercedes 300SEL vehicles are becoming increasing more difficult to identify due to the installation of Read More Read More Radio Wiring diagram for 1990 Mercedes 300E - Answers When fixing or changing a radio in a car, a wiring diagram will help make sure things are connected correctly. A wiring diagram for the radio of a 1990 Dodge Dakota can be found in its maintenance MERCEDES Car Radio Stereo Audio Wiring Diagram Autoradio MERCEDES Car Radio Stereo Audio Wiring Diagram Autoradio connector wire installation schematic schema esquema de conexiones stecker konektor connecteur cable shema car stereo harness wire speaker pinout MERCEDES BENZ Truckline CC40 no YU3F-18C838-BA . Mercedes Benz Audio 10 by Becker (BE3100) p/n A 210 820 09 86 Mercedes Wiring Diagram – Free Resources – MB Medic Mercedes Wiring Diagram – Free Resources. This page provides links to websites that contain Mercedes-Benz wiring diagrams and schematics. Bookmark this page as it contains invaluable resources. Our goal is to keep the resources in this page updated at all times. Aftermarket radio wiring | Mercedes-Benz Forum the wiring diagram for the 2-piece radio shows the speakers wired to the reciever part.. the dash part is JUST a remote control :-/ and they are connected via some proprietary data link thing. a potential alternative to going down the sides, under the door sills is to remove the passenger seat and lift the carpet and feed the wires along the passenger side of the tranny hump.