First, are the battery terminals clean and tight? Is the battery fully charged? When you crank it without being jumped, what happens?
It sounds like a loose connection to be honest. I have seen people put jumper cables on the battery terminal and by doing so, it tightens the terminal. The car starts, and then the connection is lost when a draw is placed back on the battery.
Check that and let me know.
Tuesday, January 14th, 2020 AT 7:24 PM