There will NOT be any wiring diagram available unless some good soul has put one together for this unit. Mfgs are notorious for not having these, and from the looks of many units and the wiring, they are different for each day/installer...
Most lights are 12 volt, tho on older models, many have some of both. Disconnect from shore power and pull the assembly out, then see what you can figure out. A voltmeter is a great tool to help with these problems.
2015 38RSSA #7382
2005 TK3 #1869, 10 yrs of memories
2017 F450 KR--one more Ford is it
2009 F450 4x4-died; 2010 F450-retired