Toyota 3b Repair Manual page 227

CHARGING SYSTEM
-
On-Vehicte lnspection
F
;
cH-7
he
(a)
lf
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 (_)probe of the
ammeter.
.
connect
the test
probe from the
positive
(+)
terminal of the
ammeter
to
terminai
g
of
tne
alternator.
.
Connect
the positive
(+) probe
of the
voltmeter to
terminal
B of the alternator.
.
Ground the negative (J
probe of the voltmeter.
(b)
Check the charging circuit
as
follows:
With the
engine running
from
idle to
2,OOO rpm,
check the reading on the ammeter and voltmeter.
Standard
amperage:
1O
A or
less
Standard voltage:
12Y
type
13.8
-
14.4V
at
2SoC
(7ZoFl
12.9
_
14.4V at l3SoC
(2ZSoFl
24V
type
27.7
-
29.7 V at 25oC (77oFl
26.0
-
29.7
V
at
13SoG
(27SoFl
o
lf
the
voltage reading is
greater than
standard
voltage, replace the
lC regulator.
.
ll
th9
voltage is
less than standard voltage, check
the
lC regulator and alternator
as
follows:
With terminal F
grounded, start
the
engine
and
check the voltage reading of
terminal
B.
. lf
the
voltage reading is
greater
than
standard,
replace the
lC regulator.
.
lf
the voltage reading is less than standard,
check
the alternator.
he
he
lct
['s
ts
rVe
26.0
-
28.7V
12.9
-
14.4V
H10
-il-.,};-'
cH0698