Thanks guys. Here's the update:
The starter had a little corrosion on the terminals. I cleaned them up and re-tightened but noticed some stripping on the positive post (this post is actually on the solenoid beneath the starter motor). While everything seems nice and tight, the nut can still continue turning but doens't get any tighter. So I have a suspicion this has something to do with it.
After this process the starter still won't turn, but did seem to try a little harder than it was before. So I put the charger back on it and will try again tomorrow morning. If it's still not a go, I think I'll pull the starter.
Lee, before pulling the starter, are you saying that I could just run two wires directly from a battery to the starter and expect it to turn. I tried this with just touching the bare wire ends to the posts, but got no results. It could've been because I wasn't making a good enough connection, or my spare battery could've been weaker than I thought, or the wire I was using could've been too small (but it didn't get hot, so I don't think that was the issue even though it was much smaller than the wiring on the boat).
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