Working on the '84 CD's electric antenna and spotted this above the inside the trunk above the left rear wheel. I haven't chased out the wires yet, and I was hoping one of the many experts on this forum could identify it.

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Mountain Aggie (Temporarily back in Texas)
1972 220D
1983 300CDT
1984 300CDT in restoration
1984 380SL (Dad's favorite ride)
1985 300CDT Federal
1985 300CDT Cali (now the parts car after a mishap)

I don’t know but that’s not a factory connector.

Sixto
98 E320s sedan and wagon

I haven't seen anything like that near the antenna in my 84 & 85 300D's.

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1984 & 1985 CA 300D's
1964 & 65 Mopar's - Valiant, Dart, Newport
1996 & 2002 Chrysler minivans

I have the same connector on my 84 300CD.

Constant power on the middle red wire, other than that no idea what it's for.

Attached Thumbnails

 

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1984 300CD 155k miles
1983 300TD 199k miles
2005 Legacy GT Wagon

I have the same connector on my '85 CD.

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1985 300CD, CA
172 Anthrazitgrau/Palomino 154

1985 300TD, CA
040 Schwarz/Palomino 154/3rd row seat

1985 300TD, CA
473 Champagner/Palomino 154/Cargo cover

Only on coupes?

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1984 300CD 155k miles
1983 300TD 199k miles
2005 Legacy GT Wagon

I'd put a meter between - and S then turn the radio on. This might be for an optional antenna amp. ( as in for a short wave Euro radio ) I doubt it it is for a cell phone, anyone have an option list for that car?

Shouldn’t all cars have it then?

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1985 300CD, CA
172 Anthrazitgrau/Palomino 154

1985 300TD, CA
040 Schwarz/Palomino 154/3rd row seat

1985 300TD, CA
473 Champagner/Palomino 154/Cargo cover

That should show up in wiring diagram. Could be something like rear window defogger, rear window wiper, trunk light, etc. I would have checked it, but presently don't have wiring diagrams with me.

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Graham
85 300D,72 350SL, 98 E320, Outback 2.5

The wires are thick, like for a power source. If you find some audio cables (usually red & wht pair w/ RCA connectors), it might be for a trunk-mounted CD changer which was a "must have" option, though I recall those started in the 1990's. We had one in our 2002 T&C dash, but I removed to give useful space.

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1984 & 1985 CA 300D's
1964 & 65 Mopar's - Valiant, Dart, Newport
1996 & 2002 Chrysler minivans

+,-, S...Signal? I'm guessing that it's for an amplified (analog) cellphone antenna. Or maybe a CB radio. Too early for a CD player.

Maybe S = switched.

We can rule out new car dealer outfitted mobile phone and CD changer as they didn’t exist in 1984. Such things were retrofitted from the late-80s. Is there a coil antenna on the center top edge of the back window, or a cable leading to the same position on the inside?

Time to pull the back seat and follow the wires.

Sixto
98 E320s sedan and wagon