2000 Windstar keep blowing fuse #20 on the engine compartment. Sometimes the van starts and run for about 2-3 min and them blows the fuse and vehicle shut off.
Sometimes when you cranking it blows the fuse and vehicle don't start.

 

Does everything else work after the fuse blows ? What size is the fuse ? 20,15, 25, Will the starter still make the engine turn over after the fuse blows ?
Did you add anything to the vehicle like stereo, burglar alarm ?
What have you checked so far ?