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I would start the car with an alternator tester or voltmeter connected. After start, and maybe a blip of the throttle, you should see about 13.8-14.5 volts.
If you see 12V, or less, then it is not charging.
With either output, I would probably then start with battery cable connections (clean and tight) as well as all grounds to engine and battery/frame, then if all good load test the battery
The jump box working tells me either bad/dirty battery connections or not chargimg
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1994 ERA Cobra, 496 Genesis FE TW (new addition to the stable)
70 Mustang Fastback, EFI 489 FE TKO-600, too much to list
71 F-100 4x4 EFI 461 FE restomod
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