Sounds like maybe its no more than the starter solenoid.
You can test this simply by jumping the small solenoid wire to the big plus
contact on the starter.  Make sure the vehicle is in neutral of course, and
have someone else at the controls.   It will mean getting under the van.
If you just get a good clunk, and no rotation, possibly the brushes or the
main solenoid contacts inside are shot.   If you get no noise at all the
solenoid is bad.
If there is just a wiring fault in the switch or somewhere else, the motor
should engage and run.   If the ignition is on , she should start and allow
you to get it home.
I hope you'r not in the Western rd. part of town.
Good luck   Steve