I'm installing a CD player in my '89 300SEL and have run into two problems.

The first is that the always-powered wire to the harness has only 1 volt instead of 12. It makes it so the stereo doesn't work at all. (If I jump a 12v wire to it all is good.)

The second problem is I don't know what most of the wires do. I think I have the power and antenna wires figured, but am without a guess on the speakers.

In the picture I've attached, the wires coming from the top are from the dash, the wires exiting the bottom are from a new adapter attached at the plug I've labeled "4".

Here is what I think I know (reference numbers are from the picture):

1 - I believe this to be the power antenna wire.

2 - Clearly the antenna reception plug.

3 - A guess is the anti-theft system (if correct do I need to do anything with these wires?)

3A - Looks like a ground to me.

4 - 3 power wires (always-on, switched, and illumination) and a ground wire.

5 - Speakers maybe?

5A - Looks like a ground.

So where do I hook up my 8 speaker wires (from the cd player)?
And, how do I fix my 1 volt problem?

Thanks.
-Brett

Attached Thumbnails

 

5 is all factory alarm stuff.

4 is the original power to the deck. Brown is ground; black should be constant 12v; violet/grey is dimmer; red/white should be switched 12v.

3 is for factory midbass in doors

2 runs to the antenna

1 should be the switched for the antenna

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