Alternator and Regulator Circuit Test Be sure the battery is sufficiently charged (see page 22-79). Hook up the following equipment: Ammeter, 0-400A Voltmeter, 0-20V (accurate within 0.1 V) Start the engine. Hold the engine at 3,000 rpm (min-1) with no load shift lever in Park or Neutral, until the radiator fan comes on then let it idle. Raise the engine speed to 2,000 rpm (min-1) and hold it there. Turn the headlights (high beam) on, and measure voltage at the alternator terminal. Is the voltage between 13.9 and 15.1V? YES - Go to step 6. NO - Repair the alternator components (see page 4-32).

Read the voltage at 13.5 V. NOTE: Adjust the voltage by turn the blower motor, rear window defogger, brake lights and etc. on. Is the amperage 60A or more? YES - Alternator/regulator operation is OK. NO - Repair the alternator components (see page 4-32).