If these dont work, you need to go back to your origional posting on
this,and look for other symnptoms. Perhaps a loose flywheel is binding the
starter gear.Or not allowing the starter to make full electrical contact.If
this , or other engine mechanical problems lock the starter motor, the
starter cable will heat up and melt the starter cable insulation. Is your
cable getting real hot?Oh yeah, I read the last post and the start position
allows the current to flow to the starter.Not the run position.

Is your van automatic? If so there is a neutral start switch in series with
the  solonoid,you need to consider. If it is out of adjustment, the van
wont start. Try putting the shifter in neutral and starting it.Try any gear
and start it. Look in the archives for "neutral start switch adjustment".
Not hard to do. It is located in the shifter housing.