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Generator On-Vehicle Tests - Load Test

WARNING: This page is about a different car, the 2005 Lincoln LS. However, it is still accessible from the selected car via links, so may be relevant.
  1. Switch the tester to the ammeter function.
  2. Connect the positive and negative leads of the tester to the corresponding battery terminals.
  3. Connect the current probe to the generator B+ output terminal, circuit 30-BA6 (RD).
  4. With the engine running at approximately 2,000 RPM, adjust the tester load bank to determine the output of the generator. The generator output should be at least 70 amps.
    Fig 1: Generator Load Test Graph - On-Vehicle Tests
    G03998450Courtesy of FORD MOTOR CO.
  5. With the engine running, turn the air conditioning (A/C) on, the blower motor on high speed, and the headlamps on high beam.
  6. Increase the engine speed to approximately 2,000 RPM. The voltage should increase a minimum of 0.5 volt above the base voltage.
    • If the voltage does not increase as specified, carry out the Generator On-Vehicle Tests - No-Load Test in this article.
    • If the voltage increases as specified, the charging system is operating normally.
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