If you have the owner's manual for the vehicle the fuse mapping should be located in the manual. Also, the underside of the fuse box cover typically contains a diagram which shows the correct value of the fuses as well as a high-level description of the relay functions. If you do not have the owner's manual you may need to download the owner's manual from https://www.fleet.ford.com/partsandservice/owner-manuals
or if you want to see the mapping and description information the wiring diagrams can be downloading from the "Wiring Diagrams" section of BBB Industries' site http://www.bbbind.com/free-tsb

-Rod