Low voltage will kill a Ford starter quickly. I remember some dum farmboy dragging 3 of them back to my friends parts store and being all upidy about bad parts and all. My friend refused to let him have another on until he brought the battery in for testing. Turns out he was killing them like swatting flies with his bad battery.
I agree, do the diagnostics and quit trying to guess and throw parts at it. At this point I would almost wager a bet you have probably created your own problems that are shadowing the original one if it even still exists.
The only way to approach an electrical problem is to diagnosis first, then replace. Not guess, guess, buy new parts, guess some more, pray (although that never hurts
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), guess some more, buy some more parts, ask questions, replace more parts without testing. on and on. Do the diagnostics, we will be glad to patiently walk you through the procedures.
Great ideas have always encounter violent opposition from mediocre minds.