There really isn't such a wiring diagram such as you describe for the 91 -93 model. There where laminated wall charts for dealers that showed general layout of car and components of electrical system, etc.
Now the 94 wiring manual has grids in back of book that give layout of car but of course the systems are not exactly the same.
First picture 94-95 24v wiring grid but this grid is not in 12v wiring book so wall charts are where this info whould be available.
Second picture shows where cooling fan components are located but that is how 12v book is shown each system seperately after each system wiring diagram.