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There are no wiring diagrams for the rv portion of your wiring. Never were. When your unit was new there was usually someone at the plant that rembered where the wires were run but not how they were wired up.
We at the dealers do this two ways. If it is a single panel or we get very lucky and the converter and 12 volt distribution panel are near the fridge we run the wires through the fridge roof vent.
If not we dril a hole in the roof and run through a wall down to the batteries direct.
Good Luck