If you are doing the G3X Touch, I made an Excel wiring chart that makes it all very simple. Just look under the area where the wire is (like Left Wing Root, Right Wing Root, Forward of firewall, etc) and find the wire in the left column and it will tell you where that wire attaches in the column to the right. You won't even need to open 40 page schematics manual. I think Mitch is going to add this to the new manuals.
I've attached that file here if you would like to use it or just print it and use as a reference for future use.
NOTE: I EDITED THIS POST ON NOVEMBER 30, 2019 AND DELETED THE PREVIOUS CHART AND ATTACHED A NEW, EDITED ONE WITH UPDATES.