I was not successful in getting a .dwg version of the RV-12 Electrical System diagrams from Van's for the .pdf version of the files on their web site. I tried using an online .pdf to .dwg file converter (https://www.convertpdftoautocad.com/) and was able to get the 9-page .pdf converted to 9 separate .dwg files. I have not found any data errors in the conversion and it looks like the only loss is the line colors all came out as black. I was able to open the files and edit using nanoCAD to update for some changes I made to my electrical system. Only other tip I found is to make sure the page orientation is correct for the 'C' size pages, if you leave them rotated 90 deg (appears to be the default), the converted .dwg files will also be rotated 90 deg from what you want.
