Originally Posted by Car Analogy

All your symptoms scream low voltage. From the start when reading your story, soon as you said all those dash warning lights came on, first thought, low voltage. As the story went on it just cemented the theory.

So, is it battery or charging system? You had battery checked, and supposedly its ok. Alternator is new, but its some off brand or something? In this car, I would only ever recommend a new oem alternator, a used oem one, or get your oem one rebuilt locally, if you can find a place that still does that. The last one is the best value option.

Its easy to get a basic read of health of battery and of charging system. Get a voltmeter. Harbor Freight gives them away free with a coupon sometimes, but even buying one its like $10.

Car off, meter set to read DC volts, read battery voltage. Put meter leads right on battery terminals. If its less than 12.6v, its low. You might think if your 12v battery read 12.0 volts on the meter you're good, but that is about 40% of fully charged, way low.

Next, start up car and read meyer again. Leads still connected to terminals. It should tead around 14.5 volts. Much lower than that, you have a charging system problem. Much higher than that, you have an overcharging problem (battery will cook and lose 'water').

Not that this is a definitive test, but its quick and easy and will give you an idea of battery and charging system health.