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Home >> Ford >> 1990 >> Taurus SHO >> Repair and Diagnosis >> Electrical >> Charging Systems >> Alternator - W/External Regulator >> Testing (On-Vehicle) >> Load Test

Load Test

  1. Attach tachometer to engine. Start engine and turn on A/C-heater blower motor to high position. Turn headlights on high beam. Increase engine speed to 2000 RPM.
  2. If voltmeter indicates a minimum increase of .5 volt over battery voltage, alternator operation is normal. If voltage increase is less than .5 volt, proceed to UNDERVOLTAGE TEST.
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