There isn't too many wiring diagrams available for Sunline unfortunately. The few I know of are located in the "Files" section and can be downloaded.
What year is your camper? What wires do you see? Depending on the layout, there is usually not alot of wiring in the front. Typically running lights and maybe an outlet.
This is a picture of a 2004 T1950, the small black and white 12 volt wires are for the clearance lights, one in each upper corner and middle of each side near the front.20191228_094651.jpg
Current Camper: 2006 Sunline T-264SR
Previous Camper: 1998 Coleman Mesa
Tow Vehicle: 2002 Chevrolet Avalanche 2500, 8.1L, 4X4
DirecLink Brake Controller, Draw-Tite Ultra Frame Receiver, Reese HP Trunnion Bar Hitch W/ HP DC