Looking at the wiring diagram for a late and early Pantera, fuse 10 supplies power to just the ac condenser and ac clutch relay coils which are under the dash on the drivers side. The power to the ac condenser fan motor and the ac compressor clutch themselves is supplied by fuse #7. If everything is wired correctly, the problem is not with the compressor or ac condenser fan.
Fuse #10 also supplies power to the blower motor which is via the oblong switch. This is the evaporator / heater blower motor. Is this the switch you turn on that causes the fuse to blow?
Panteraplace is a great resource for electrical diagrams.
http://www.panteraplace.com/page107.htm
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