[MagicRat]

Often, Ford products have a fuseable link in the main power wire coming from the battery. The link behaves like a fuse for the entire car and is intended to blow only when there is a very large power draw.
The link cannot be replaced, the main power wire must be replaced.

The wire can be tested. Also, if it blown, the car must be checked for a source of such a large power draw or the new link will blow too.

The only things I can think of to do this is a fault with the starter motor or starter solenoid, or a bare power wire rubbing on a metal part of the car. Any other electrical failure would blow the corresponding fuse in the fuse box; not the link itself.