Bear with me please
When this all began...........The starter just didn't do a thing.
Turn the key to start........ heard the relay click once, nothing whatsoever from the starter. Quiet.
Thought the battery was dead, I was in a Wal-mart parking lot with a cart full of food.
I went back in the store and purchased a 1000 CA battery, and installed it. No change when turning the key.
I crawled under and tapped the starter and it fired right up. This engine starts easy with just a bump of the key normally.
Got it home, and replaced the corroded ground cable. Nothing changed, wouldn't start.
Swapped out the starter with my used good spare. Nothing, wouldn't start.
Replaced the fender solenoid for a new one, it fired right up. It worked great, and better than it ever had before. This lasted a month.
Was at work, and done for the day, same thing happened all over again. Tapped the starter and it cranked and fired. Got it back home.
Inspecting the positive cable after this thread started, and found it to be corroded completely, replaced with a new Motorcraft high dollar nice cable. No crank. Can hear the fender solenoid click once, but its as if the pos cable was off the starter.
I just yanked the starter out, bench tested both starters and they both work flawlessly.
Re-installed the original starter, cranked and fired. Weak crank though. It still has a problem getting power to the starter somehow, somewhere, there is a drain of power.
This is where it stands of now.