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Home >> Mazda >> 2003 >> Tribute ES, FWD >> Repair and Diagnosis >> Engine Performance >> System >> Engine Controls - Trouble Shooting - With & Without Codes >> Charging System >> Component Tests >> Generator On-Vehicle Tests - Load Test
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Generator On-Vehicle Tests - Load Test

  1. Switch the battery tester to the ammeter function.
  2. Connect the positive and negative leads of the battery tester to the corresponding battery terminals.
  3. Connect the current probe to the generator B+ output terminal, circuit (Y/W).
  4. With the engine running, turn the A/C on, the blower motor on high speed and the headlamps on high beam.
  5. Increase the engine speed to approximately 2,000 RPM. The voltage should increase a minimum of 0.5 volt above the base voltage.
    1. If the voltage does not increase as specified, carry out the Generator On-Vehicle Tests. For additional information, refer to ON-VEHICLE TESTING .
    2. If the voltage increases as specified, the charging system is operating normally.
  6. Adjust the tester load bank to determine the output of the generator. Generator output should be at least 58 amps.
    Fig 1: Generator On-Vehicle Tests Graph - Load Test
    G01898076Courtesy of FORD MOTOR CO.
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