Ford's F-Series line of trucks consists of the 1/2-ton F-150 and the larger Super Duty line. The F-250 was the smallest of the Super Duty line for the 2002 model year. While the F-250 had smaller brakes and lighter duty suspension components that the F-350 through F-550, they all shared several systems, including the interior and exterior lights. For safety and legality purposes, Ford recommends bi-weekly inspection of the exterior lights, including the turn signals. When you discover a burned-out bulb, replace it before driving the F-250 again.
Remove the key from the ignition and turn off all of the F-250's lights. Open the truck's hood.
Remove the two hex-head retaining screws located below the front turn signal assembly, using a socket wrench and a 6-mm socket. Pull the turn signal assembly out of the F-250's front clip.
Rotate the turn signal socket counterclockwise to unlock it from the turn signal assembly. Pull it out of the assembly. Pull the old bulb out of the socket and discard it.
Plug the new 3157K bulb into the turn signal socket. Insert the socket into the turn signal assembly and rotate it clockwise to lock it in place.
Slide the turn signal assembly back into the F-250's front clip. Reinstall the two turn signal assembly retaining screws with the socket and socket wrench. Close the F-250's hood.
Lower the F-250's tailgate to expose the two side-mounted turn signal retaining screws. Remove the screws with the socket wrench and 6-mm socket.
Pull the turn signal assembly off the back of the F-250 to expose the back side of the turn signal sockets. Rotate the turn signal socket counterclockwise to release it from the turn signal assembly.
Pull the socket out of the turn signal assembly. Pull the old bulb straight out of the socket and discard it. Plug the new 3157K bulb into the socket.
Slide the socket into the turn signal assembly and rotate the socket clockwise to lock it into the assembly. Reposition the assembly on the back of the F-250.
Reinstall the two turn signal retaining screws. Close the F-250's tailgate.
