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Generator On-Vehicle Test - Load Test

WARNING: This page is about a different car, the 2005 Ford Pickup, 2005 Ford F550 Super Duty, 2005 Ford F450 Super Duty, and 2005 Ford Cab & Chassis. 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 lead, circuit 36 (YE/WH).
    4. NOTE: Make sure to disconnect the generator that is not being tested.
    Fig 1: Generator Output Graph
    G04003354Courtesy of FORD MOTOR CO.
  4. With the engine running at 2,000 rpm, adjust the tester load bank to determine the output of the generator. The generator output should be at least 87 amps. GO to SYMPTOM CHART  for the diagnostic procedures.
  5. With the engine running, turn the A/C on, (if equipped) the blower motor on HIGH 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.
    • Backprobe the I circuit at the generator connector (connector plugged in) and measure the I circuit voltage. If the voltage is less than 2 volts, install a new generator. Refer to GENERATOR AND REGULATOR .
    • If the voltage does not increase as specified, carry out the Generator On-Vehicle Tests - No-Load Test,.
    • If the voltage increases as specified, the charging system is operating normally. Proceed to the following battery tests.
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