Use an ohm meter to verify the solonoid is/not shorted. If your ohm meter showes a direct short, it needs to be replaced.
The larger solonoids normally show around 30 ohms resistance.
The larger style solonoides are rebuildable if the internal winding is burnt/shorted.
Regardless of what type of transmission your dealing with, a simple path of battery through your TB switch to one side of the solonoid, is all that should be required.
If you remove the battery lead from the solonoid and apply the TB switch, do you still blow the fuse? If so your problem is some where between your switch and the wire up to the solonoid.
Hope this helps.