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Home >> Saturn >> 1993 >> SC2 Automatic >> Repair and Diagnosis >> Electrical >> Charging Systems >> Alternator & Regulator >> On-Vehicle Testing >> Battery/Alternator Load Test (ARBST Test)
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Battery/Alternator Load Test (ARBST Test)

  1. Clean battery terminals and attach ARBST load tester. Attach clamps to appropriate terminals. Clamp current probe to wiring going to negative battery terminal. Arrow on probe should point toward battery.
  2. Press CHARGING SYSTEM TEST button. Display should show correct number of cylinders. To change number of cylinders, press appropriate button on keypad.
  3. Run engine at 2000 RPM until display flashes MAINTAIN 2000 RPM. Hold at 2000 RPM until counter counts down from 10 seconds. When 10 seconds are over, run engine at idle until display flashes MAINTAIN IDLE.
  4. Hold at idle for a few seconds until display flashes TEST COMPLETE. Turn engine off. Press CONTINUE button to see results of testing. ARBST tester will display voltage and current output of alternator.
  5. With a good battery in vehicle, voltage output should be greater than 13 volts. All CS series alternators should be able to produce within 15 amps of rated output at 2000 RPM.
  6. Sedan and Coupe models use an 85-amp alternator and should have a current output of at least 60 amps. If alternator does not pass voltage and current tests, ensure battery is fully charged and no excessive electrical loads. If battery and electrical loads are okay, replace alternator.
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