Ford isn't stupid about safety. Things inside the car wiring are very well protected either by fuses or by fuse links.
What they can't control is someone later sticking the wrong fuse in, moving wires, or removing fuse links. That burned spot should have a 15 amp fuse. A spot below it to the left is supposed to have a 5 amp fuse, and I see a 30 amp. That's another wire fire waiting to happen. Another spot should have a 15A and it has a 30.
With crap like that it isn't any wonder you are buying a harness.
The ECU won't cause the wiring to burn up like that if nobody has jacked the wiring all up or used the wrong fuse sizes.
What you have is a ticking bomb with all the oversized fuses installed, I mean you have a 30A where it should be 5A. That fuse feeds dash light wires. That's another wire melt waiting to happen.
The fuse all burned up just runs things like dash indicators, some modules, solenoids, and things. Once you melt one wire in a harness into another wire, which will happen when someone does stupid stuff with fuse size and you get a short, then all heck can break loose.
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89 LX. 363, single turbo S482 FMW, Super Vic EFI, Fox Lake Stage III heads, solid roller, glide. Holley HP EFI. (combo varies)