There is a link to the Barient 18 diagram, courtesy of Ericsonyachts.org. It is a PDF file. Go to that web site, then to;
Links, Resources & Downloads > EY.o Downloads Center > Non-Model Specific Documentation
I would post the URL directly, but Sailnet won't allow me to, as I have fewer than 10 postings in my history.
1983 Ericson 33
Channel Islands, California