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At this time it appears your alternator failed and this meant the vehicle was running off of battery voltage until the battery voltage was gone and it died. A good battery should have 12.6 volts and a running engine will show 13-15 volts at the battery if charging correct.
I stated how to test the battery and alternator and stated it appears like the alternator is to blame so far, I do not know why you rated me as a bad tech for that?
The alternator is accessed from under the car since its mounted under the engine near the sub frame.
If the battery connections are sparking and getting hot that means that something major is on or there is a short to ground in the power circuit.
2003 Jetta left rear window blue plastic part of the