Fig. 6: Identifying Ignition Switch Connector Terminals
Courtesy of FORD MOTOR CO.
5. Remove battery junction box fuse No. 111 (40-amp). Measure resistance of Light Green/Violet wire
between ignition switch harness connector terminal B5 and output side of battery junction box fuse No.
111. See Fig. 6 . If resistance is less than 5 ohms, replace ignition switch. See appropriate STEERING
COLUMN SWITCHES article in ACCESSORIES & EQUIPMENT. If resistance is 5 ohms or greater,
repair open in Light Green/Violet wire between ignition switch and battery junction box. See WIRING
DIAGRAMS . Check system operation.
6. Turn ignition switch to LOCK position. Disconnect starter motor relay connector (Tan/Red wire).
Measure voltage between ground and Tan/Red wire at starter motor relay connector terminal while
holding ignition switch in START position. If battery voltage is present, replace starter motor relay.
Check system operation. If battery voltage is not present, go to next step (A/T models) or go to step 12
(M/T models).
7. Disconnect Digital Transmission Range (DTR) sensor 12-pin connector. Measure resistance of Tan/Red
wire between DTR sensor connector terminal No. 12 and starter motor relay connector. See Fig. 7 . If
resistance is less than 5 ohms, go to next step. If resistance is 5 ohms or greater, repair open in Tan/Red
wire between DTR sensor and starter motor relay. See WIRING DIAGRAMS . Check system operation.
2003 Ford Pickup F150
2003 STARTING & CHARGING SYSTEMS Starters - F150 Pickup