First check fuse!!
Second check your fans DO actually work, by supplying them with 12v, direct to motors.
Next check supply on car fan switch in radiator bottom corner, it should have a live feed to one of the terminals when ignition on, if OK, then bridge these two terminals with wire and the fans should run(fingers!!).
If you have 12v supply at switch and the fans don't run when bridged(leave bridged) then turn your attention to the fuse box, and see if the fuse holder(fan fuse) has MELTED, it most likely has.
You NOW have TWO options, 1 to repair the ford wiring/fuse box problem, remembering that whatever caused the problem in the first place is STILL THERE, ie overloading due to bad design, OR make upo another sub loom just for the fans, which will be so much more reliable, and what most people do, 2 hours at most VERY simple to do, with override etc if wanted.
I switched mine negatively so that it can stay on after the car is turned off, but if the override switch is left ON it still turns OFF with ignition, if wired correctly.
tabetha