Carbuff and I have both had our FFE's sitting at our respective dealer's lots most of the time since January this year, while they've attempted to diagnose them. (His dealer was awesome enough to admit defeat and buy his 2013 back from him, while my 2014 was just towed back this week for its third visit.) The main wiring harnesses on both of our cars have been replaced *more than once* due to the dealership breaking tabs on the connectors while replacing the harness.
However, through all these months of waiting neither of us has had to pay a dime since the cars are covered under the 8-year EV component warranty. I don't see any reason Ford corporate shouldn't cover 100% of the parts & labor cost of attempting to repair your car. If your dealer can't point out any non-warranty parts on your receipt, you have no obligation to pay them anything, it's between them and Ford.
However, through all these months of waiting neither of us has had to pay a dime since the cars are covered under the 8-year EV component warranty. I don't see any reason Ford corporate shouldn't cover 100% of the parts & labor cost of attempting to repair your car. If your dealer can't point out any non-warranty parts on your receipt, you have no obligation to pay them anything, it's between them and Ford.