It should be in the owners manual.
Most repair manuals have the wiring diagrams in them.
try eBay or gumtree
Click on the link below Click on Tech Library
After crawling under mine (Canadian Version) I find but 1 ..
You can find an online repair manual for a 1993 Ford Ranger on websites like AutoZone, Haynes, or Chilton, which offer repair guides for various vehicle models. Additionally, forums dedicated to Ford Ranger enthusiasts often share resources and links to manuals. Websites like eBay or Amazon may also have physical or digital copies of repair manuals available for purchase.
Salvage yard or dealer in that order.
Other than a Ford Dealership, you might try looking in auto recycling yards (aka junk yards).
where do you find horn fuse on 1993 e250 ford van
A diagram of what component?
There is no cabin filter to find.
Search online, you can find it!