The 2003 ford f 150 has 2 different fuse boxes.
2003 ford f150 4 6 fuse box diagram.
Remove the panel cover to access the fuses.
Passenger compartment fuse panel.
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Passenger compartment fuse panel ford f150 1997 2003.
Ford f 150 1997 2004 fuse box diagram.
Passenger compartment fuse panel diagram.
Power distribution box diagram ford f 150 fuse box diagrams change across years pick the right year of your vehicle.
To remove a fuse use the fuse puller tool provided on the fuse panel cover.
How to locate the power distribution box and passenger fuse box as well as complete diagrams showing fuse types fuse locations and complete fuse panel desc.
Https fuse box info ford ford f 150 1997 2003 fuses and relay fuse box diagram location and assignment of electrical fuses and re.