CHECK BATTERY VOLTAGE
- If 20 minutes have not passed since the engine was stopped, turn the ignition switch ON and turn on the electrical system (headlamp, blower motor, rear defogger etc.) for 60 seconds to remove the surface charge.
- Turn the ignition switch OFF and turn off the electrical systems.
- Measure the battery voltage between the negative (-) and positive (+) terminals of the battery. Standard voltage : 12.5 ~ 12.9V at 20°C (68°F) If the voltage is less than specification, charge the battery. See «PRELIMINARY TEST»(ref-272904-S39425067052007112900000) .
CHECK THE BATTERY TERMINALS & FUSES
- Check that the battery terminals are not loose or corroded.
- Check the fuses for continuity.
CHECK DISCHARGE WARNING LIGHT CIRCUIT
- Warm up the engine and then turn it off.
- Turn off all accessories.
- Turn the ignition switch "ON". Check that the discharge warning light is lit.
- Start the engine. Check that the light is lit. If the light does not go off as specified, troubleshoot the discharge light circuit.
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 over-heated 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.
Note. The nominal 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. Therefore, the nominal output current may not be obtained. If such is the case, keep the headlamps on and cause a discharge of the battery, or use the lights of another vehicle to increase the electrical load. The nominal 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.
- 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 (90A alternator): 63A min.
- 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.