Damn it! Car won't start!!

This week just really isn't working too nicely for me...

Yesterday, I was checking my engine compartment to see if I had any leaks after replacing my cam seals, crank seals, water pump, radiator fluid, and oil. I noticed that the positive terminal on my battery was all corroded. This has been happening somewhat often, so I decided to replace the terminal connecter. I unscrewed the old one, and put the new one on... Pretty simple.

I continued with my plan to wash and wax my car. After doing so, I tried to start it up. No go.

The car just goes "click click click click" fairly rapidly. I have a battery charger, so I hooked the battery up to it. It was at about 90% charge when initially connected, so I let it charge to 100%. The charger also has a 50amp "start" setting, so I wired up and tried to start the car with that. It sounds like the starter is trying to crank the motor over, but only does it for about 0.5 seconds. The sound is sort of a very sloooow rev.

I checked all the connections... Negative ground, negative terminal, positive terminal, both connections to the starter, and the connection to the alternator. I even tried to clean them a little.

Unfortunately, I now have a new problem: The small post on the alternator broke when I was trying to tighten the nut on it. Does anyone if the post can be replaced without replacing the whole alternator assembly? I just soldered the wires on for the time being.

Any help anyone? Thanks.