Output Test

1. With ignition switch off, check voltage at "R" terminal and "L" terminal. Reading at both terminals should be 0 volts. If either reading is not 0, alternator is defective.
2. Turn ignition switch on but do not start engine. Voltage at "L" should be 1-3 volts. If voltage is 0, alternator and regulator are defective.
3. If voltage at "L" is close to battery voltage with ignition on, short circuit the "F" terminal to the rear alternator housing. See Fig 1.
4. Read the voltage at "L" with "F" terminal shorted. If voltage is lower than battery voltage, the regulator is defective. If voltage is close to battery voltage, alternator is defective.
5. With ignition switch off and battery ground cable disconnected, connect ammeter between alternator terminal "B" and cable. Connect voltmeter between "B" (+) terminal and ground. See Fig 1
6. Start engine and accelerate to 2000-3000 RPM. Turn on all lights and check ammeter for specified output.
   Fig 1: Alternator "F" Terminal Location

   Courtesy of NOT AVAILABLE

The terminal is located inside the hole at a depth of approximately 0.8" (20 mm)  .

Fig 2: Alternator Output Test Arrangement

Courtesy of NOT AVAILABLE

Illustration applies to all vehicles  .