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Calibration Test

  1. Required test equipment is a 10-ohm resister and a 73-ohm resister.
  2. Disconnect wiring connector at sending unit. Connect one of the resistors between lead wire terminal and ground. Turn ignition switch to "RUN" or "ACC" position. With 10-ohm resister, gauge should show a full-scale reading. With 70 ohm resister on Aerostar and 73 ohm resister on all other models, gauge should read at "E" mark.
  3. With no resister (open circuit), gauge reading should be the same as with ignition switch in "OFF" position. If reading is okay, replace wire connection to sender.
  4. If gauge pointer does not move and stays below "E" mark, check for an open circuit in wiring assembly, gauge windings, or instrument cluster printed circuit. If gauge pointer moves with no resistor connected, check for a short circuit in sender unit lead. If gauge reads out of calibration, replace IVR (if equipped) and retest. If calibration is still incorrect, replace gauge.
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