Ford f150 won't crank 

I saw Eric O smash one of those starters with big nasty right in half so he has easier access to the top bolt lol

Yaaaaa , nicely done bud , man that was awesome editing . My f150 manifold been leaking for 7 years on my 2010 , once warm it seals up.

Bravo to you for the correct testing procedure. You know you got power to the S post because the solenoid clicked, and although corrosion right at the stud is hard to exclude it is far more likely the problem is deeper. Even the M post wire was crusty green downstream. As you know drop testing only works if you get current flow, which didn't happen. However if voltage drop on the B wire or ground was the cause, you would have seen a dramatic drop. It's unsatisfying to see no drop at all but even light bulb testing with a substituted load is not well matched to the extreme current draw these devices use. I guess you could have taken a dremel to the tip of the S post for a better reading, but the practicality of having no helper and no easy alligator clip attachment point makes it difficult.

Battery is too small, and where is the tie down...that thing must be rocking and rolling in there. Should be a group 65 and that thing said 59?

Geez, from the title I thought maybe your wife had used the one you guys own and it broke down again

Rusty and crusty. May have been ok with the connections being cleaned, but when you have a new starter there...... I would have done the same, just to make sure theres no call back.