Oh. Now you say so -- I thought you might be looking for body wiring ... those are published and all over the place.
I don't think any diagram was ever published for the audio. But the good news is that if you're talking about the factory wire-up, it's very standard among all Fords ... the same components were used for all Fords for quite a number of years. If you're looking for how the head unit connects to all its peripherals (speakers, ground, etc), you just might be able to ask any installer at any mobile audio shop ... certainly they'll have seen enough stock Fords to tell you which wire goes where. If you buy a new power head, you can get the Ford adapters so you don't have to rip out all the speaker wire (real PITA). Otherwise, you might have to just follow the wires from the speakers in.
If you're looking for a schematic of the head unit, I wouldn't look too hard: I really doubt you're gonna find one.
Good luck.
