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You can pull the tail light/running light lead from the trailer harness, typically it's a brown wire.
Excellent question, I’ll lurk, since mine has been left undone for 3 months.
However I do have a clean overall photo to show. Imagine your laying down under the rig, feet down past the axle. Look up and imagine the spare and all it’s mounting mess is gone. Then you will see this wiring bundle left sharp in the photo. Note that my 99 has rear air and might have some wiring for that.
What wire is the tailgate license light wire? Hmmmm?
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