According to Ford's digital owners guide, the fuse box for the Ford F350 is located in the upper portion of the passenger footwell. An access panel covers this fuse box and may be removed in order to gain access to the fuses.
When removing and replacing fuses in the Ford F350's fuse box, disconnect the battery first to protect against electrical dangers. A small tool called a fuse puller is stored inside the fuse box and may be used to quickly and safely remove fuses from the fuse box. After replacing fuses, replace the fuse box cover before reconnecting the battery.