Welcome to the forums!
The explanation described above (despite the suggestion from Airstream's site that you will get shop manuals) will help you find owner's manuals, but the wiring diagrams will be found in the shop manuals, which I have yet to find online. I bought one for my '73 on ebay in pdf format, but if you do a google search outside the forums for "airforums shop manual" you will find several threads that describe the various sources of shop manuals (none of which are free of charge, as I recall).
good luck!
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