Becker 754 Security Wire Grounding

[Golden80s]

Hello all,

Getting ready to re-install the Becker 754 radio (Satan's own) in my '86 560SEL.

Many years ago I had the five-pin security connector left off. A "grounding clip" was evedently spliced into the wire and cliped in somewhere. Good so far BUT WHERE?

The reason I ask is when I pulled the radio out the whole mess came out with it and I cannnot for the life of me figure out to what or where I should clip that clip to keep things nice and quiet.

Any thoughts would be most welcome.

Thanks in advance!