Originally Posted by jwikoff99
I think the alternator is a pretty good bet.
I agree. In particular, the dash controller (gauges, DIC, etc.) will reboot itself if voltage dips too low for a second, which is why you're seeing the occasional needle sweeps and display prove-outs.
First, hook up your battery to a charger and give it a _solid_ charging session, such as overnight. If things seem back to normal the next day, get an output test done on your alternator: I think you're going to find that it'* not recharging the battery properly.
(Once your battery gets a nice full charge, things may appear to be all better again, but that'* only because you can drive for a surprisingly long time on battery power alone, before system voltage gets so low that weird things start happening, as you saw.)