I would have to look at the books again (they are out in the garage) but I believe the older Dakota also does the resistance on the ground side. I think Dodge went with that system to fix the burned up fuse boxes in the glove boxes on the 70s -80s trucks.
The Dakota resister is located in the air box under the hood, where the air enters the heat/ac unit. I believe the modern Durango has the resister in the box between the heat and the ac unit. I suspect the location of the resistor is probably most of the problem.