Battery not Charging - Dead Alternator?

[XfireZ51]

In this case it appears to be a bad connector. I recently pulled my battery because I check fluid level in the cells periodically. I needed to add distilled water and so pulled the battery otherwise its difficult to do it properly. While I had the battery out I sprayed some Kroil into the bolt bosses for the cables. Cleaned off the threads on the cables off. Then put the battery on a charger for the night to make sure all the cells were “firing”. Up to this point I had been dealing w a voltmeter gauge that would fluctuate especially when turn signals or fans would kick in. The deflection in the pointer was pretty significant and even at steady cruise I would see the pointer vibrating. Marc looked at it and thought I could be the gauge that needed replacing. The digital readout on the cluster would also show a voltage fluctuation so it was not just a gauge issue.
Well after topping off the battery, cleaning the cable inputs and a full charge,
No more vibrating pointer. Voltage steady as a rock. Before this, I was concerned about the alternator as well.
Just thought I would put that out there.