240D Radio Wiring - Mercedes-Benz Forum

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post #1 of 3 (permalink) Old 12-19-2004, 06:19 AM Thread Starter
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Date registered: Dec 2004
Vehicle: 1981 240D
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240D Radio Wiring

It seems that I can find everything on the internet except a wiring diagram for my 1981 240D. I found the following, but it doesn't quite square. I also have a brown/white and some other weirdness. Anyone have any updates to this?

P o w e r
Memory (+12v Constant) Red
Ignition (+12v Switched) Black/Yellow
Ground (-) Brown
Illumination Gray/Blue
Dimmer (none)
Power Antenna Blue

S p e a k e r s
Right Front (+) Black/Green
Right Front (-) Black
Left Front (+) Black/Red
Left Front (-) Black
Right Rear (+) Black/Green
Right Rear (-) Black
Left Rear (+) Black/Red
Left Rear (-) Black
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post #2 of 3 (permalink) Old 12-19-2004, 04:26 PM
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Date registered: Jun 2003
Vehicle: 1991 300 SE
Location: Lakeland, Florida
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RE: 240D Radio Wiring

I believe switched is the red wire, brown is ground. Blue is for the antenna (perhaps clock as well) and I ran a memory wire from the battery to the stack for the presets. The speakers are easy to figure out and you may want to use a test light.
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post #3 of 3 (permalink) Old 12-19-2004, 04:33 PM
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RE: 240D Radio Wiring

This should help you some:


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