Toyota 4-Runner 1985 Repair Manual page 310

CH-4
-r-
Batter~
.I
2,000 rpm
CHARGING SYSTEM - On-Vehicle Inspection
CH0068
CH0279 CH0010
Terminal F
CH0185
7. CHECK CHARGING CIRCUIT WITHOUT LOAD
NOTE:
If a battery/alternator tester is available, conne,... ...
the tester to the charging circuit according to the man',
turer's instructions.
(a) If a tester is not available, connect a voltmeter and
ammeter to the charging circuit as follows:
• Disconnect the wire from terminal B of the alter-
nator and connect it to the negative terminal of the
ammeter.
• Connect the test lead from the positive terminal of
the ammeter to terminal 8 of the alternator.
• Connect the positive lead of the voltmeter to ter-
minal 8 of the alternator.
• Connect the negative lead of the voltmeter 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: Less than 10 A
Standard voltage: 13.5 - 15.1 V
(Regulator case 25 0 C or 77 0 F)
• If the voltage reading is greater than standard vol-
tage, replace the IC regulator.
• If the voltage reading is less than standard voltage,
check the IC regulator and alternator as follows:
With terminal F grounded, start the engine and
check the voltage reading of terminal B.
• If the voltage reading is greater than standard
voltage, replace the IC regulator.
• If the voltage reading is less than standard voltage,
check the alternator.
8. CHECK CHARGING CIRCUIT WITH LOAD
(a) With the engine running at 2,000 rpm, turn on the high
beam headlights and place the heater fan control
switch at HI.
~, (b) Check the reading on the ammeter.
EC0137 CH0068
Standard amperage: More than 30 A
If the ammeter reading is less than 30 A, repair the alter-
nator. (See page CH-5)
NOTE: With the battery fully charged, sometimes the in-
dication will be less than 30 A.
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