Alternator and Regulator Circuit Troubleshooting
Special Tools Required
Alternator, Regulator, Battery & Starter tester OTC3131
Available through the Honda Tool and
Equipment program 1-888-424-6857
- Make sure the battery connections are good and the battery is sufficiently charged.
- Connect the alternator, regulator, battery & starter tester (OTC3131) to the battery as shown.
- Start the engine. Hold the engine speed at 3,000 rpm with no load (in N or P) until the radiator fan comes on, then let it idle.
- Do the charging system test.
Does the display indicate the voltage is within 13.5-15.1 V and the amperage 87.5 A or more?
YES - Go to step 5.
NO - If the voltage is less that 13.5 V, go to alternator control circuit troubleshooting (see Alternator Control Circuit Troubleshooting ) if the voltage is over 15.1 V and amperage is less that 87.5A, replace the alternator:
- '07 model (see ALTERNATOR REMOVAL AND INSTALLATION )
- '08-10 models (see REMOVAL ('08-10 models) )
or repair the alternator (see ALTERNATOR OVERHAUL ).
- Check the diode condition on the display.
Does the display indicate GOOD?
YES - The diode is OK. Troubleshooting is complete
NO - If the display indicates BAD, replace the alternator:
- '07 model (see ALTERNATOR REMOVAL AND INSTALLATION )
- '08-10 models (see
REMOVAL ('08-10 models) )
or repair the alternator (see ALTERNATOR OVERHAUL ).