Suzuki Repair: schmatics, chilton manuals, decent answer

Question
where can I get wiring schmatics for a '90 izusu amigo?

Answer
You'll probably have to purchase a service manual.
CAUTION!
The diagrams in the Haynes and Chilton manuals are frequently not worth much.  Usually just enough to get you into real trouble without a decent answer.  As a 30+ year professional, my advice is to either get someone with access to an Alldata system or a FACTORY service manual to sell you copies, or just suck it up and buy one.  Trying to do any kind of serious diagnosis with a "brand x" diagram is sorta like throwing that familiar bovine by-product at the fan ... you KNOW what's gonna happen.