Toyota Celica Supra 1986 Service And Repair Manual page 222

CH-4
~
B.atter'!l._
I
•
v
. . . . ..
•
CHARGING SYSTEM -On-Vehicle Inspection
B
0
0
Atternator
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7. CHECK CHARGING CIRCUIT WITHOUT LOAD
NOTE:
If
a battery/alternator tester is available. connea
the tester to the charging circuit according to the manufac.
ture~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
tht
ammeter.
• Connect the test lead from the positive terminal
ol
the ammeter to terminal 8 of the alternator.
• Connect the positive lead of the voltmeter to ter·
minal B 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 lOA
Standard voltage: 13.5- 15.1V
(Regulator case 25' C or 77' F)
• If the voltage reading is greater than standard
voltage, 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 .
Standard amperage: More than JOA
If the ammeter reading is less than 30A, repair the alter-
nator. (See page CH-5 )
NOTE: With the battery fully charged, sometimes
the
indication
will
be less than 30A.
..