System Test

INSPECT CHARGING CIRCUIT WITHOUT LOAD

NOTE: If a battery/alternator tester is available, connect the tester to the charging circuit as per manufacturer's instructions.

(a) If a tester is not available, connect a voltmeter and ammeter to the charging circuit as follows:
a. Disconnect wire from terminal B of alternator, then connect ammeter negative probe to the wire.
b. Connect ammeter positive probe to B terminal of alternator.
c. Connect voltmeter positive probe to B terminal and the negative probe to ground.






(b) Check the charging circuit as follows:
With the engine running from idling to 2,000 rpm, check the reading on the ammeter and voltmeter
Standard amperage: 10 A or less
Standard voltage: 13.9 - 15.1 V at 25°C (77°F) 13.5 - 14.3 V at 115°C (239°F)
If the voltmeter reading is greater than standard voltage, replace the IC regulator.






If the voltmeter reading is less than standard voltage, check the IC regulator and alternator as follows:
- With terminal F grounded, start the engine and check the voltmeter reading of terminal B+.






- If the voltmeter reading is greater than standard voltage, replace the IC regulator.
- If the voltmeter reading is less than standard voltage, check the alternator.






INSPECT CHARGING CIRCUIT WITH LOAD
(a) With the engine running at 2,000 rpm, turn on the high beam headlights and place the heater blower switch at "HI".

(b) Check the reading on the ammeter.
Standard amperage: 30A or more.






If the ammeter reading is less than standard amperage, repair the alternator.

NOTE With the battery fully charged, the indication will sometimes be less than standard amperage.