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I have seen several other posts over a period of time relating to the same thing. As mentioned earlier, the VERY FIRST TWO THINGS I'd check would be the ignition switch, and, starter solenoid. If, by chance, it IS the ignition switch, you MIGHT be able to get it working properly temporarily, until you have time to fix it properly, by spraying WD-40 into it. I did that to mine. I sprayed it into the lock where the key goes HEAVILY, until it was gushing out. Then I cycled the switch repeatedly (with battery disconnected), flooded it again to wash out all the loosened crud, then dried everything real good. It works fine now. Heck, I might not even replace mine.
I started with the starter relay (the gut at the parts store mention that it a common occurence) but no luck, dropped the starter and had it tested, DOA. So with a new starter, solenoid, and relay it works fine. I think it may have been a bad relay, which in turn kept power to the starter even after it was turned off, and then burned the starter out. Just a guess, but something to consider. Thanks for the help.
vekrause, I think that is EXACTLY what happened. The way that Fords are set up, it is NOT POSSIBLE for the starter to keep cranking, unless the solenoid (relay) keeps sending it juice. So, like you said, the solenoid was the first problem, thus killing the starter as a result. Good to hear you're back in business!