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What are the symptoms here? Nothing coming on or poor performance?
So this is for the outside unit and not inside? Some of those are in inline fuses. Did you check that are first?
Let me grab some wiring diagrams and get them to you when I go home for lunch. I can't attach them from my tablet.
Attached is the link to the Winnebago Wiring Diagrams for this year and model. I looked and didn't see anything for an outside radio and plug. Perhaps were those a dealer installed option? http://www.winnebagoind.com/diagram/Wiring.htm