The '83 PA50 shop manual's wiring diagrams should be close enough.
It's just a matter of which one to use.
For my '78 PA 50 II, I first singled out all the non-battery diagrams (they're the ones where the 'Pink' wire from the alternator is _disconnected_), then all the ones that _had_ horns, then the ones _without_ turn sigals, etc.
I was left with just the one that I needed. Hopefully, you will have the same luck - I doubt Honda changed the wiring too much between '82 and '83.