Here are the scanned images from my Bertone X1/9 wiring diagram book, which I bought in 1996 from a reputable Fiat parts dealer. It has no publish date, copyright information, or ISBN number, and the book itself looks like a set of photocopies bound with one of those plastic cook-book type ring binders, so I really don't see anything unethical about making the diagrams available here. Besides, you need to fix your car, right? So here you are.
These are my original 300 DPI one bit scans. They probably won't view or print correctly from your browser, but they look fine when printed from Gimp or Photoshop after you set the image resolution to 300 DPI correctly. If you are stuck with a Microsoft Windows-type OS and no good software, you may be able to print nicely with this software: http://www.wingimp.org but I haven't tried it.
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Here's a better view of my scribbled changes on page 2 (JPEG, 56937 bytes) which was a hack to get the low beams to work without buying another switch.
