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Old 09-16-2011, 08:38 AM   #1 (permalink)
BenzWorld Junior Member
Date registered: Jul 2009
Vehicle: 1988 420sel
Location: Bville Arkansas
Posts: 12
Smile 420sel radio wiring diagram

my 420sel has had the radio wiring harness cut, and i believe it has the Becker grand Prix system. if someone could pm me a wiring diagram or just tell me what the different colors go to it would be appreciated.
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Old 09-17-2011, 07:41 AM   #2 (permalink)
BenzWorld Member
Date registered: Jun 2011
Vehicle: 1984 380se
Location: easton, pa
Posts: 129
Go to the service manual sticky and follow the directions till you get to your model and year and click the "Electrical Troubleshooting" tab. Then select the "How To Use" tab and go down to page 5. There is a useful wire color coding chart, copy it for future use. Then go to the "Circuit Diagram Index" and select your radio.

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