I have ordered the paper wiring diagrams for several vehicles. The later models are becoming quite intensive----lots of careful tracing of schematic paths. I have found that the EVTM is more helpful for most all issues and is easier to follow. The cost of paper diagrams is so cheap that why not order both. Unless you have major issues, try the EVTM (Electrical & Vacuum Troubleshooting Manual)
I got the printed version of the Ford Factory EVTM and the Ford Factory CD (EVTM, Service manual, System Test Proceedures, etc.) for my '92 SC on ebay. The (used) printed versions are usually harder to find, but the CD's are generally listed for about $10.00(US)
Here are some current examples: http://cgi.ebay.com/ebaymotors/1992...991535617QQcategoryZ34221QQrdZ1QQcmdZViewItem