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Starter Motor - Motor Feed Circuit

WARNING: This page is about a different car, the 2005 Mercury Mountaineer and 2005 Ford Explorer. However, it is still accessible from the selected car via links, so may be relevant.
  1. Make sure the battery is fully charged. Refer to CHARGING SYSTEM - GENERAL INFORMATION .
  2. Disconnect the inertia fuel shutoff switch (IFS switch).
  3. Connect a remote starter switch between the starter solenoid S-terminal and the battery positive (+) terminal.
  4. Connect the Rotunda 73 Digital Multimeter positive lead to the battery positive (+) post. Connect negative lead to the starter solenoid M-terminal.

    Motor Feed Circuit 

    Fig 1: Connecting Rotunda 73 Digital Multimeter Positive Lead To Battery Positive (+) Post And Negative Lead To The Starter Solenoid M-Terminal
    G03948424Courtesy of FORD MOTOR CO.
  5. Engage the remote starter switch. Read and record the voltage. The voltage reading should be 0.5 volt or less.
  6. If the voltage reading is 0.5 volt or less, go to the STARTER MOTOR - MOTOR GROUND CIRCUIT COMPONENT TEST .
  7. If the voltage reading is greater than 0.5 volt, indicating excessive resistance, move the Rotunda 73 Digital Multimeter negative lead to the starter solenoid B-terminal and repeat the test. If the voltage reading at the B-terminal is lower than 0.5 volt, the concern is either in the connections at the starter solenoid or in the solenoid contacts.

    Motor Feed Circuit 

    Fig 2: Moving Negative Lead To Starter Solenoid B-Terminal
    G03948425Courtesy of FORD MOTOR CO.
  8. Remove the cables from solenoid B-, S- and M-terminals. Clean the cables and connections and reinstall the cables to the correct terminals. Repeat Steps  3 through  6. If the voltage drop reading is still greater than 0.5 volt when checked at the M-terminal and less than 0.5 volt when checked at the B-terminal, the concern is in the solenoid contacts. Install a new starter motor.
  9. If the voltage reading taken at the solenoid B-terminal is still greater than 0.5 volt after cleaning the cables and connections at the solenoid, the concern is either in the positive (+) battery cable connection or in the positive battery cable itself.
  10. By moving the Rotunda 73 Digital Multimeter negative lead toward the battery and checking each mechanical connection point, the excessive voltage drop can be located. When the high reading disappears, the last mechanical point that was checked is the concern. Repair or install a new connection as required.
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