Below scans of the wiring diagrams are provided by:

Jason Hamilton

The Online Karmann Ghia Resource 
http://www.type-14.com/

1956 -1957 Karmann Ghia Wiring Diagram 
(This is the same diagram as applied to the Beetle. Ignore the references to Beetle-only features such as semaphores)


 

58-60 VW Karmann Ghia Wiring Diagram

 This is a 628 KB 3-page Acrobat .pdf file. It includes a fuse diagram and a key to unit designations.

Save it to your hard drive for reference. Click the image to open.