You did not say if you bought your motor home new or used.
If you bought it new you should have and elect. plot Plan showing you where your wires go though out your Rig as well as all your pluming.
If not you might check with the manufacture to get a copy.
I don't understand why when someone sells their rig why they don't give the buyer the manual that they receive with the Rig when they bought it, new of course.
When I up graded to a newer M.H. I pass along a file container that included every piece of paper and folders on all the appliances and you name it I had it in the container.
I still have all the paper work to the 1997 Dolphin M.H. that I have now and I will continue to compile it until I get rid of it.
Just a thought.