Make sure the battery connections are good, and that the battery is sufficiently charged. Hook up the following equipment: Ammeter, 0−400 A Voltmeter, 0−20 V (accurate within 0.1 V) Shift to Neutral, and start the engine. Hold the engine at 3,000 rpm (min −1 ) with no load 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 13.3 and 15.3 V?
YES | - | Go to Step 6 .
NO | - | Replace the alternator or repair the alternator. ■
Read the amperage at 13.5 V. NOTE: Adjust the voltage by turn the blower motor, rear window defogger, brake lights and etc. on. Is the amperage 60 A or more?
YES | - | Alternator/regulator operation is OK. If the charging system indicator is still on, replace the alternator.■
NO | - | Replace the alternator or repair the alternator. ■