Gents, I'm wondering what the purpose of this intermediary plug is:



As you can see the 8-wire plug plugs into an intermediary plug from which three wires emanate. I just removed this off a w123 tail light electrical panel I had in storage. My guess is that the intermediary plug is for models with reverse lights built into the rear bumper. But I didn't know that was an option for sedans, and would have assumed such a plug was only placed on wagons. Is that what the plug is for? I'm hoping it is, because I have a wagon bumper on my sedan, and this could help me wire the reverse lights without soldering the wires directly onto the 'pins' of the existing plug.

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My guess is for the red back fog light on some models outside of the US

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Von
Fairport, NY
1973 Unimog 416 Doka
1980 Unimog 416 Doka
1981 Unimog 416 Doka
1984 Euro 280CE w/diesel conversion
1985 300TD Estate wagon
(I really need to stop buying these things!)
http://vonsmog.com

Trailer wiring??

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Baton Rouge, LA
1977 300D Non-Turbo

That would have been my guess but it appears that if you disconnect that plug power would cease to flow to whatever is downstream - series instead of parallel.

Dan