## Charging System

#### Charging Circuit Troubleshooting (cont'd)

4-29

Alternator and Regulator Circuit Test

1. Be sure the battery is sufficiently charged (see page 22-79).
2. Hook up the following equipment:

- Ammeter, 0-400A
- Voltmeter, 0-20V (accurate within 0.1 V)

3. 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.

4. Raise the engine speed to 2,000 rpm (min-1) and hold it there.
5. 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).

6. 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).