Test A: Instrument Cluster Inoperative
- Turn ignition switch to LOCK position. Disconnect instrument cluster 22-pin harness connector C266b. Turn ignition switch to RUN position. Measure voltage between ground and instrument cluster harness connector C266b terminals No. 13 (Blue wire) and No. 16 (Violet wire). See Fig 1. If both voltages are 10 volts or more, go to next step. If either voltage is less than 10 volts, repair open in Blue wire or Violet wire between central junction box and instrument cluster.
- Turn ignition switch to LOCK position. Measure resistance between ground and instrument cluster harness connector C266b terminal No. 20 (Black wire). If resistance is less than 5 ohms, go to next step. If resistance is 5 ohms or more, repair open in Black wire between instrument cluster and ground point. Ground point is located behind right side of instrument panel.
- Disconnect all instrument cluster harness connectors. Inspect for corroded or pushed out pins. Connect all instrument cluster harness connectors. Operate system and verify if concern still exists. If concern still exists, replace instrument cluster. See REMOVAL & INSTALLATION . If concern does not exist, system is operating correctly at this time. Concern may have been caused by a loose or corroded connector.
Courtesy of FORD MOTOR CO.