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Starter Motor - Feed Circuit Test

WARNING: This page is about a different car, the 2012 Ford Pickup. However, it is still accessible from the selected car via links, so may be relevant.
  1. Make sure the battery is fully charged; carry out a battery Drain test. REFER to BATTERY, MOUNTING AND CABLES .
  2. Connect a remote starter switch between the starter solenoid C197B and the battery positive terminal.
  3. Connect the Digital Multimeter positive lead to the battery positive post. Connect the negative lead to the starter solenoid "M" terminal.
    Fig 1: Checking Starter Motor - Motor Feed Circuit
    G06258730Courtesy of FORD MOTOR CO.
  4. Engage the remote starter switch. Read and record the voltage. The voltage reading should be 0.5 volt or less.
  5. If the voltage reading is 0.5 volt or less, go to the starter motor-ground circuit component test.
  6. If the voltage reading is greater than 0.5 volt, this is an indication of excessive resistance in the connections, the positive battery cable or in the starter solenoid. Move the Digital Multimeter negative lead to the starter solenoid C197A and repeat the test. If the voltage reading at starter solenoid C197A is lower than 0.5 volt, the concern is either in the connections at the starter solenoid or in the solenoid contacts.
  7. Remove the cables from starter solenoid C197A, C197B 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 or less than 0.5 volt when checked at C197A, the concern is in the solenoid contacts. Install a new starter motor. Refer to Starter Motor - 3.5L GTDI, 3.7L  or Starter Motor - 5.0L (4V), 6.2L (2V)  .
  8. If the voltage reading taken at starter solenoid C197A is still greater than 0.5 volt after cleaning the cables and connections at the solenoid, the concern is either in the battery cable connection or in the positive battery cable itself.
  9. Clean the positive battery cable connection. If this does not solve the problem, install a new battery cables. REFER to BATTERY, MOUNTING AND CABLES .
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