Anyhoo, there are two orange/white wires that pass through this connector and one has little red markers on it on either side of the connector. And of course the marker slipped off one side when we cut out the roached connector, so we had to do some CSI-level scientific analysis of cut and stripe angles to sort out which orange/white wire had the marker.
Everything's all good now (holy crap the lights are a lot brighter!), but even after peering at the wiring diagram for several minutes with a magnifier, I could not sort out what the heck these wires actually do and how they're different, and what the potential consequences are of mixing them up.
I seem to recall I once knew, a memory of a memory, but it's buried under the mental rubble somewhere.
So what do these wires do, and what's the difference between the unadorned orange/white and the orange/white with a red marker?

- Gandalf, in a letter to Frodo speaking of Barliman Butterbur in Tolkien's "Fellowship of the Ring"

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