I would start by checking under the seat to see if a wire got pinched by the mechanism. You might have to remove the side trim to get a good look. If you find a connector under there, disconnect it and try another fuse. If it doesn't blow then the short is after the connector, and vice versa. Bob
That was my thought.
With my own power driver seat, the cabling seems vulnerable to abrasion damage, not cleanly dressed as I would have expected, but I couldn't come up with a better method either. I once considered protecting the wires with split loom, but never followed through with that idea. Now I got something else to do before we leave on our trip.
Here is what split loom looks like. It is sold at all auto parts stores & Radio Shack, offered in different diameters. It is sliced all the way through so it can be slipped over an existing cable with connectors already attached. The general practice is to use the smallest diameter that works and electrical tape the ends to prevent it from moving around.
The power driver seat is an aftermarket feature supplied by Phoenix USA, not Ford.