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It looks OEM. Have you been getting any codes? I don't see that on my D but then again I have an 4.7 SLT. It looks like it's near the a/c components. Do you have a/c in your r/t?
The wiring harness incluudes every connector your D would need if you had every available option. Typically nowone gets every option and there are connectors that go nowhere. If you had anything that plugged into that it would be very close to the connector. Don't sweat it.
It's going good. I got a job at the local International dealer (in Reno). WA was a bust and I am the go to guy for all the clutches, trannies, rear mains, diffs and anything else that involves a mechanic to be on their back all day long.