I used draw.io for mine - works great, simple, web and app for mac and pc.
Don't the RV-14 plans include a full wiring diagram? I guess if you will do things a little differently you will need to draw something.
Here's an example and a link to my drawings:
https://vansairforce.net/community/s...0&postcount=55
Another good thread on the same topic can be found here:
https://vansairforce.net/community/s...d.php?t=171303