Generator Test (Overcharged Battery Check) - Suzuki SX4 Service Manual

2) Run engine from idling up to 2,000 rpm with all
accessories turned off and read meters.
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, proceed to
the following check.
Specification for undercharged battery (No-load
check)
Current: 10 A
Voltage: 14.2 – 14.8 V at Hi (H) (at 25 °C, 77 °F)
Voltage: 12.5 – 13.1 V at Lo (L) (at 25 °C, 77 °F)
NOTE
Consideration should be taken that voltage
will differ somewhat with regulator case
temperature as shown in figure.
16.0
15.3
15.0
14.2
14.2
14.0
[A]
13.6
13.0
12.5
12.5
12.0
11.0
-30 0 25
[A]: Regulated voltage (V)
[B]: Heatsink temperature (°C)
14.8
14.8
H
13.3
13.1
13.1
L
11.6
135
[B]
I2RH0B1A0005-01
3) Ground "F" terminal and start engine, then measure
voltage at "B" terminal as shown in figure.
• Voltage is higher than standard value. It is
considered that generator itself is good but IC
regulator has been damaged, replace IC
regulator.
• Voltage is lower than standard value. It is
considered that generator itself has problem,
check the generator.
Load Check
1) Run engine at 2,000 rpm and turn on head light and
heater motor.
2) Measure current and if it is less than 20 A, repair or
replace generator.

Generator Test (Overcharged Battery Check)

1) To determine battery condition, refer to "Battery
Description".
2) If obvious overcharged 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,
disassemble generator.
4) Check ground of brushes. If brushes are not
grounded, replace IC regulator. Then check field coil
for grounds and shorts.
16.0
15.3
15.0
14.2
14.2
14.0
[A]
13.6
13.0
12.5
12.5
12.0
11.0
-30 0
[A]: Regulated voltage (V)
[B]: Heatsink temperature (°C)
Charging System:
I2RH011A0008-01
S7RW0A1A04004
14.8
14.8
H
13.3
13.1
13.1
L
11.6
25 135
[B]
I2RH0B1A0005-01
1J-5