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There are two good sources for these manuals which come with wiring diagrams. Faxon Automotive Literature and Lloyd's. Once I get to my computer, I can send you a link for those. Hope that will prove helpful here. Please get back to me if you need more later as all follow ups are included in our fee.
Go to the attached link for Faxon. http://www.faxonautoliterature.com/
And here is the link for Lloyd's........http://www.lloydsautolit.com/
Keep in mind that you want to look for a 1982 GM chassis manual.
I am adding another link that may have some helpful manuals available for this. http://www.irv2.com/forums/f22/p-series-chevrolet-motorhome-manual-83273.html
And here is a link to one you can download without any cost.........
Just checking back in to see if you were able to snag a manual for your coach from one of these sources?