I don't see one here for an '84 but maybe something on this site will help.
If you can be specific about what you want, I'll take a digital photo of the
pages from my Bentley and email them to you.

Roger

 <A HREF="http://www.vintagebus.com/wiring/">Click here: VintageBus.Com - VW Bus (and other) Wiring Diagrams</A>