Chris,
While I can't help you with your request for wiring schematics, thought I would mention -
I too have a 23' Slingshot (one year older than yours) that has the exterior front light that hasn't worked for a while. I could not determine the cause of the outage so thought I would just remove and replace the fixture (which also appeared to have a leak issue due to poor quality factory caulking). At the same time, I discovered some significant mold emanating from the inside right front wall (behind the light fixture). It appears that water has entered the outer wall of the trailer through the hole they cut to pass the wires through (they actually butchered the wall and cut a bunch of smaller holes that resulted in a way too large hole for the wires - at least 5 x the necessary size). I am now in the process of removing the inside front wall, two cabinets and shelf to deal with the mold and re-insulate the wall. The light still does not work.
Hope you do not have the same problems.
Although I researched this trailer extensively prior to purchase, I have found it to be the worst and most poorly built trailer I have ever owned (three previous).
If you have any other questions about this particular trailer, that I can help you with, let me know.
Marv