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  #1  
Old 08-19-2017, 07:52 AM
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Join Date: Jun 2002
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Install factory radio

Hi everyone,

I had an aftermarket stereo installed in my '89 420sel along with new speakers and speaker wire. I had the Becker unit rebuilt and would like to re-install it.

I can't find a diagram or anyone who seems to be able to provide a general idea how this system is wired. The fader was "cut from the loop" and I would like to use it again if possible.

Any information would be appreciated. The guy from Becker said they do not have diagrams and 3 Mercedes dealerships said the same thing.

Thanks in advance for any information.
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  #2  
Old 08-19-2017, 01:16 PM
Diseasel300's Avatar
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You just need the wiring diagram for the "radio" for a 1989 model W126. They will all be the same. The FSM has it, or you can find it on the Startek site or Google should provide the answer. The factory wiring isn't anything special, whoever says they can't get the info on it is either lazy, ignorant, or lying.
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Old 08-19-2017, 09:15 PM
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Thanks for the reply.

I have searched google and have not found anything to date.

I'm not sure what FSM is. Can you elaborate?

Startek says from 1994 to present unless I am accessing the wrong site.
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Old 08-20-2017, 12:24 AM
Diseasel300's Avatar
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FSM is shorthand for factory service manual.

W126 is available here: https://www.startekinfo.com/StarTek/outside/12253/?requestedDocId=12253

I've attached the relevant pages for your model as a PDF below. 1988+ seems to have a fairly complex system.
Attached Files
File Type: pdf radio.pdf (335.1 KB, 45 views)
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'11 Honda Accord EX - "The Daily" 64K
'83 500SL Euro - "The Money Pit" 116K
'91 350SD - "The Diseasel Jr." 168K
'86 300SDL - "The Diseasel" 189K (Totaled 1/31/19)
The Diseasel Thread - Everything You Didn't Know You Wanted To Know
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  #5  
Old 08-20-2017, 10:09 PM
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This is a big help - thanks for the information.
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