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Alternator and Regulator Circuit Troubleshooting

  1. Make sure the battery connections are good and the battery is sufficiently charged.
  2. Connect a VAT-40 (or equivalent tester), and turn the selector switch to position 1 (starting).
    Fig 1: Identifying VAT-40
    G05444284Courtesy of AMERICAN HONDA MOTOR CO., INC.
  3. Start the engine. Hold the engine speed at 3,000 RPM, with no load until the radiator fan comes on, then let it idle.
  4. Do the charging system test.
  5. Raise the engine speed to 2,000 RPM, and hold it there.

    Is the voltage within 13.5 - 15.1 V? 

    YES  - Replace the alternator (see ALTERNATOR REMOVAL AND INSTALLATION ), or rear housing assembly (see ALTERNATOR OVERHAUL ).

    NO  - Go to step 6.

  6. Check the alternator, regulator, battery & starter tester display..

    Is the amperage 90.0 A or more? 

    YES  - The charging system is OK.

    NOTE: If the charging system indicator is still on, replace the alternator (see ALTERNATOR REMOVAL AND INSTALLATION ).

    NO  - Replace the alternator (see ALTERNATOR REMOVAL AND INSTALLATION ), or repair the alternator (see ALTERNATOR OVERHAUL ).

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