Last time under my car I noticed a wiring connector in the same area as you mentioned.
I don't know what it's for as yet and cannot understand why Ford put it in such a vulnerable location.
The connector is fastened rather cheaply by one of those underdash type black "push" plugs. Considering its location, I'd say something like a twig pulled it down.
If you are gonna buy the car, I'd take it to a shop myself and check it out. It may be as simple as pushing the little fastener back into its little hole!
Hope that helps...