I don't know if mine is the same as yours, but they are both Fords. On mine in the lower right corner there is a tab, you pull it out of the way and the distribution box cover swings out towards you. I also have that latch that you can pull, but it does nothing. I hope that this helps you.
Jack
2003 Rexhall Vision 27'
2019 Chevrolet Equinox
States we have been to with this MH