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Voltage Drop Test

NOTE: Make all voltmeter connections at component terminal rather than at cable or wire end.
  1. Verify battery condition. Battery voltage should be 12 volts or more. Load test battery at approximately one-half cold cranking amperage rating. See load tester manufacturer's instructions. If battery is okay, go to next step. If battery voltage is less than 12 volts or loaded battery voltage is less than 9.6 volts, service battery or charging system as necessary.
  2. Disconnect inertia fuel shutoff switch connector. Connect remote starter switch between starter solenoid terminal "S" (Red/White wire) and positive battery terminal. Using a digital voltmeter set at lowest voltage scale, connect positive voltmeter lead to positive battery post, and negative lead to solenoid terminal "M". See Fig 1 .
  3. Engage remote starter switch. Voltmeter should indicate .5 volt or less. If voltmeter indicates .5 volt or less, go to STARTER GROUND CIRCUIT TEST  . If voltmeter indicates more than .5 volt, move negative voltmeter lead to solenoid terminal "B".
  4. Engage remote starter switch. If voltmeter indicates less than .5 volt, solenoid connections or contacts are bad. Clean solenoid terminals "B", "S" and "M". Repeat steps  14 . If voltmeter still indicates more than .5 volt at terminal "M" and less than .5 volt at terminal "B", solenoid contacts are bad. Replace starter motor. See STARTER MOTOR  under REMOVAL & INSTALLATION.
  5. If voltmeter indicates more than .5 volt at terminal "B", clean cables and connections at solenoid. If voltmeter still indicates more than .5 volt at terminal "B", check for poor positive battery cable connection or bad cable. Repair or replace as necessary.
  6. To locate excessive voltage drop, move voltmeter negative lead toward battery, and check each connection point. When high voltmeter reading disappears, last connection point checked is cause of problem.
Fig 1: Testing Voltage Drop
G95B12519Courtesy of FORD MOTOR CO.