After much looking, I found a link to the Becker plug diagram. Look towards the bottom of this page--
http://www.beckerautosound.com/connect.jpg

Well, you've gotten farther than I have in my search for the connections! I'm trying to find all the connection diagrams so I can know what to look for as far as the antennae hook-up in my 91 300SE.

Has anybody installed an Alpine CDA-9813 in thier car? Mine had it already installed when I got it and after much searching behind the dash, I cannot locate the antennae/power lead. The old becker was in the trunk but of course it doesn't have the standard plugs on the back we're all used to with American cars....

Thanks all and sorry for hijacking the thread...