Hi Hurstbrd,
Welcome to the Heartland Owners Forum.
I don't think the factory provides wiring diagrams.
If you have 50 amp service, the incoming #6 wire is routed from the exterior receptacle to the back of the main circuit breaker panel. If you pull the panel away from the wall (with power disconnected), you'll probably be able to get a pretty good idea of where the wires go.