F-100, 250, 350 (1965-69) E-100, 200, 300 (1965-67) P-100, 350, 3500 (1965-74) U-100 (1965-74)

Turn ignition key to "ACC" position. Slightly depress pin in hole of switch, turn key counterclockwise and pull key and lock cylinder out of switch assembly. Press in on rear of switch and rotate switch 1/8 turn counterclockwise (as viewed from terminal end). Remove bezel and switch (on "U" models and "P" models, also remove retainer and spring). Remove insulated plug and wire from rear of switch. If new ignition switch as well as lock cylinder is to be installed, insert screwdriver into lock opening of ignition switch and turn slot in switch to full counterclockwise position.