New Underdash Wire Harness Question

I went out and took a picture of mine just to compare my 73 duster to maybe your 69 Barracuda I think it was? Anyways here's a picture of the driver side these two wires plug into the door switch. I see one wire is actually two wires going into one plug and one wire going into one plug.
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And here's the driver side it's just one wire with one connection I assume this is just some sort of completion of some kind of ground circuit?
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