Excuse me for asking, but what are we talking about here? I don't understand what kind of trailer a 2007 3600 is, or are we talking about the TV, don't understand that either. Wiring diagrams for Keystone trailers are not shared by Keystone with anyone except their authorized dealers which is unfortunate and most everyone has to do what you are already doing now. You can use a tone generator and probe to locate wires; these are sold at Lowes and Homedepot in the computer LAN section for home LAN IT wiring. Sorry but I can't be any more help than that.
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2005 Springdale 249BH FW
2008 Toyota Tundra Crewmax 5.7L
Tow package
Timbrens
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