This sounds to me like the cable going to the starter is either loose or has corrosion on it.
Anyway I have included in the diagrams below a factory troubleshooting flowchart that will specifically pinpoint the problem your van is having with the starting system. You will need a multimeter and a battery load tester to do these tests but they are straight forward and easy to do and will ensure that your van is fixed right. Go through it and get back to us with what you find out.
Images (Click to enlarge)
Tuesday, February 26th, 2019 AT 9:12 PM