I'm basically way out of my league here, but is this the F4UB-14A411-A connector?
I'm only familiar with this because of the connectors at the other end (rear of vehicle) that are involved in the "Camper Kit" (bunch of pigtails in a box) that came with a big fold-out paper chart of sketches. This is an excerpt from (for year 2000) is a similar document I found online. Is that your connector on the last page (page 133 on document) at the bottom? I put green borders around it. (The section with the red borders was marked earlier for my own use.)
If not, just ignore me and move on. Under the hood is NOT my area of expertise, and Ford factory wiring even less so. And this is a "modified vehicle connector" (whatever that means) and I know you said you don't have that sort of thing. Still....?
Okay, couldn't get a .pdf to upload, so I took a screen shot of an excerpt of the excerpt. If this turns out to have potential, I can upload more of it.