Repair Procedures: Result
- The voltmeter may indicate the standard value.
Standard value: 0.2V max
- If the value of the voltmeter is higher than expected (above 0.2V max.), poor wiring is suspected. In this case check the wiring from the alternator "B" terminal to the battery (+) terminal. Check for loose connections, color change due to an overheated harness, etc. Correct them before testing again.
- Upon completion of the test, set the engine speed at idle.
Turn off the headlamps, blower motor and the ignition switch.
- The ammeter reading must be higher than the limit value. If it is lower but the alternator output wire is in good condition, remove the alternator from the vehicle and test it.
Limit value: 60% of the voltage rate
NOTE:- The maximum output current value is shown on the nameplate affixed to the alternator body.
- The output current value changes with the electrical load and the temperature of the alternator itself.
Due to temperature the maximum output current may not be obtained. If such is the case, keep the headlamps on to increase the electrical load.
The maximum output current may not be obtained if the temperature of the alternator itself or ambient temperature is too high.
In such a case, reduce the temperature before testing again.
- Upon completion of the output current test, lower the engine speed to idle and turn off the ignition switch.
- Disconnect the battery ground cable.
- Remove the ammeter and voltmeter and the engine tachometer.
- Connect the alternator output wire to the alternator "B" terminal.
- Connect the battery ground cable.
- If the voltmeter reading agrees with the value listed in the regulating voltage table below, the voltage regulator is functioning correctly. If the reading is other than the standard value, the voltage regulator or the alternator is faulty.
Regulating Voltage Table (Internal mode)
Voltage regulator ambient temperature °C (°F) Regulating voltage (V) -30 (-22)
25 (77)
135 (275)13.9 ~ 15.2
13.9 ~ 14.9
13.4 ~ 14.7 - Upon completion of the test, reduce the engine speed to idle, and turn off the ignition switch.
- Disconnect the battery ground cable.
- Remove the voltmeter and ammeter and the engine tachometer.
- Connect the alternator output wire to the alternator "B" terminal.
- Connect the battery ground cable.
Regulating Voltage Table (External mode)