Suzuki Grand Vitara JB627. Manual - part 116
1J-5 Charging System:
Generator Test (Undercharged Battery Check)
S6JB0B1A04003
This condition, as evidenced by slow cranking or
indicator clear with red dot can be caused by one or
more of the following conditions even though indicator
lamp may be operating normal.
The following procedure also applies to cars with
voltmeter and ammeter.
1) Make sure that undercharged condition has not been
caused by accessories left on for extended period of
time.
2) Check drive belt for proper tension.
3) If battery defect is suspected, refer to “Battery
4) Inspect wiring for defects. Check all connections for
tightness and cleanliness, battery cable connections
at battery, starting motor and ignition ground cable.
5) Connect switch (6), load (5), battery (4), voltmeter
(3) and ammeter (2) to generator (1) as shown in
figure.
Voltmeter: Set between generator “B” terminal
and ground.
Ammeter: Set between generator “B” terminal
and battery (+) terminal.
NOTE
Use fully charged battery.
6) Measure current and voltage.
No-Load Check
1) Run engine from idling up to 2000 rpm and read
meters.
NOTE
Turn off switches of all accessories (wiper,
heater etc.).
Specification for undercharged inspection
Current: 10 A
Voltage (at 20
°C (68 °F)): 14.2 – 14.8 V
NOTE
Consideration should be taken that voltage
will differ somewhat with regulator case
temperature as shown in the figure.
• If voltage is higher than standard value
If voltage is higher than standard value, check ground
of brushes.
If brushes are not grounded, replace IC regulator.
• If voltage is lower than standard value
If voltage is lower than standard value, check rotor
and stator, rectifier, brushes, regulator.
Load Check
1) Run engine at 2000 rpm and turn on head light and
heater motor.
2) Measure current and if it is less than 30 A repair or
replace generator.
Generator Test (Overcharged Battery Check)
S6JB0B1A04004
1) To determine battery condition, refer to “Battery
2) If obvious overcharge condition exists as evidenced
by excessive spewing of electrolyte, measure
generator “B” terminal voltage at engine 2000 rpm.
3) If measured voltage is higher than upper limit value,
proceed to “Generator Disassembly and Assembly”.
4) Check ground of brushes. If brushes are not
grounded, replace IC regulator. Then check field coil
for grounds and shorts, referring to “Generator
Inspection”.
IYSQ011A0007-01
[A]: Regulated voltage (V)
[B]: Heat sink temperature (
°C)
[A]: Regulated voltage (V)
[B]: Heat sink temperature (
°C)
16.0
15.5
14.3
15.2
14.8
14.2
13.3
14.6
15.0
14.5
14.0
13.5
13.0
-30
0
20
[A]
[B]
68
22
120 (˚C)
248 (˚F)
(V)
I5JB0A1A0006-02
16.0
15.5
14.3
15.2
14.8
14.2
13.3
14.6
15.0
14.5
14.0
13.5
13.0
-30
0
20
[A]
[B]
68
22
120 (˚C)
248 (˚F)
(V)
I5JB0A1A0006-02