AeroElectric Connection. Don't run a wire without it. You can purchase a hard copy, or download the pdf for free. If you subscribe to the Matronics aeroelectric list, you get consults with the author for free, too.
http://forums.matronics.com/index.php
https://matronics.com/aeroelectric/Catalog/AECCatalog.html
http://www.aeroelectric.com/Book/AEC_R12A.pdf
Charlie
So I was dumb enough to buy the "aircraft wiring guide" sold on vans website.
It's "coincidentally" written by the guy who invented the vertical power system. Its not a bad book, but unless you actually want to use the vertical power system get something else. I read it cover to cover in one sitting and then about 30 minutes later ordered the aeroelectrical connection. Like people recommended, its a good book.