Car wont start unless door is open

You're ahead of me. View attachment 1715886450

With 11.5 volts in the run circuit, then check the battery votlage and the ammeter reading with the key in run.
That way ypou'll know if its just a low battery, or if there is a poor connection.

Welp. The entire dash is currently out of the car including ammeter. We pulled it and fixed a few problems behind the dash and it has been easier to work on.
We currently have the the two wires that go to the ammeter vice gripped.

Of course careful not to touch ground