It sounds like you're used to working on older cars with a single wiring diagram... No such luck here. Ford published an entire inch-thick book of 'em for each year of production. The electrical systems in these cars are fairly complicated.
It's called the EVTM - Electrical & Vacuum Troubleshooting Manual (it's ~95% wiring diagrams, ~1% vacuum diagrams and 4% explanation).
If you're looking for a specific part of the electrical system (i.e. charging system, stereo wiring, etc.), I'm sure someone can scan in the page you're looking for, but there are slight differences for each year (89-90-91), so it'd be best if you specify what year you're looking for as well.
