Car not starting

Welcome to 2CarPros.

If the battery is dead and the alternator isn't producing a charge, the engine will stall. Since it stalled when the jump vehicle was disconnected, either the battery is too weak to keep it running, the alternator isn't recharging the battery, or you have a bad connection at the battery. Make sure the terminals are clean and tight, too.

Here are a few links you may find helpful:

https://www.2carpros.com/articles/how-to-charge-your-car-battery

https://www.2carpros.com/articles/car-battery-load-test

If recharging the battery gets it running, check the alternator for output. Here is a link that shows how it's done:

https://www.2carpros.com/articles/how-to-check-a-car-alternator

Let me know what you find.

Joe