Hello and welcome to just answer. What is the fuse # XXXXX where is it located? Under the hood or under the dash?
Ok, that would be fuse #8 according to my diagram. Does your van have ABS brakes? If so, I see that that fuse also supplies power to the ABS system, and may be the cause of the short. If you do have ABS, then try disconnecting the ABS module connector and see if the fuse still blows.
The ABS controller is mounted under the dash next to the brake pedal bracket.
The CAB is mounted under the instrument panel on the side of the brake pedal bracket toward the center of the vehicle Mounting Location Of Controller Antilock Brakes. .
CAUTION: Be sure ignition switch is in the off position before removing the 60 way connector from the CAB.
There must be a wire that is shorting out somewhere (rubbing on a metal bracket etc.) See if you can make the fuse blow by wiggling various sections of the wiring harness under the dash, and look for signs of the harness rubbing. One area I see causing shorts is where the wiring goes near the parking brake, so inspect that area closely.