You can contact Helm Publications at 1 800 782 4356 or at their website at http://www.helminc.com and order a new one.
Search online, you can find it!
In your glove box
No known web site.
In the owners manual
It should be in the owners manual.
Try on-line "Google"
autozone.com has free online manuals
Try e-bay.
You can view the 2003 Ford Ranger OWNERS manual online at : www . motorcraft service . com ( no spaces ) Click on Owner Guides * for North America
YOU CAN FIND THE MANUAL FOR ALL FORD PRODUCTS AT THE FORD WEB SITE .
You can find it at the technical site at the related link below.
The Owners Manual will have extensive information on the fusebox systems. See "Related Questions" below