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Old 05-30-2003, 05:21 PM
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w124/Becker "Grand Prix" Schematics??

I recently purchased a 1987 300e with a bad head unit, not requiring code, just in bad shape. Can anyone tell me specifically what each of the four top right poles and five in the middle are? Also, is the prong in the middle bottom ground or alarm related? I noticed that it is attached to a type of bridged harness. Thank you very much for any input.
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Old 06-02-2003, 11:53 AM
Zeus's Avatar
Moderating, Eh?
Join Date: Feb 2000
Location: Canada
Posts: 1,774
I wouldn't bother...

Ditch it and buy an aftermarket unit! The Becker is outdated, sounds/performs horribly and will just cause you more trouble in the future, why waste your time and effort? Just my $0.02...
2007 E550 4Matic - 61,000 Km - Iridium Silver, black leather, Sport package, Premium 2 package
2007 GL450 4Matic - 62,000 Km - Obsidian Black Metallic, black leather, all options
1998 E430 - sold
1989 300E - 333,000 Km - sold
1977 280E - sold
1971 250 - retired

"And a frign hat. They gave me a hat at the annual benefits meeting. I said. how does this benefit me. I dont have anything from the company.. So they gave me a hat." - TheDon
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Old 06-02-2003, 04:12 PM
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Well, the actual head unit is fried, I was just looking for the wiring diagram so I could determine which wire was which as far as installing the aftermarket head unit I have now.
Consequently, I did finally find the information I needed and if anyone else needs it as well, the coding on the cars harness for the HU is as follows:
Purple w/gray stripe = power with headlights switched on with
first click
Brown = ground
Red w/white stripe = power directly
to battery connect to the yellow wire of the new stereo
Black w/yellow stripe = igniton key in accessory position,
connect to the red wire of the new stereo
blue/white wire which operates the antenna, connect it to the
blue or blue/white wire of the new stereo

Of course, the speaker wires are self explanatory with the exception that the rear channel doesn't hook directly in to the head unit....

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