You need to understand the Winnebago wiring schematics. They're similar to an industrial wiring schematic. All the 12 volt wires are the same color. They have a wire number printed on every wire each foot or so for the entire length. The number on the wire identifies where it comes from and where it goes.
Here's a link to the wiring number identification table:
http://www.winnebagoind.com/diagram/electrical_guide.pdfIt covers many years and is in alpha numeric order.
Here's a link to the online wiring information.
http://www.winnebagoind.com/diagram/Help.pdfIt identifies different aspects, codes, notes, and detailed views used in the drawings. Keep in mind these are engineering drawings and as such require some knowledge of drafting standards to properly interpret.