AirMan PDS400S-6C3, Service Manual

Page: 63 / 102

3. Electric System
3-25
3.5 Alternator
ISUZU part number:898092-1122
PC12038E
(1) List of functions
Pin No.
(Terminal No.)
Line
color
Connection Function
(B) Y
Starter motor B terminal
(Through 60A fuse)
Power for charging voltage.
CN14-1(R) R/Y Starter switch ACC terminal Detect voltage of ACC terminal and adjust the
current flowing to rotor coil
CN14-2(L) Y
Emergency controller
CN2-11 terminal
Generation signal is outputted to emergency
controller.
After engine starts, and if generation signal
will not occur, charging malfunction warning
lamp is made to light on.
Time lag
：
5 seconds
Output of hour-meter function signal
E B Grounding
－
(2) How to check
Checking method by voltage measurement Normal value
Measure the battery terminal voltage at full load operation. DC28.5
±
0.5V
(3) Check and confirm the following when faulty charging warning lamp lights on
Nominal
capacity
DC24V-50A
Measure battery voltage when
stopping
Recharge battery
Abnormality
: Less than DC24V
Normality:
Repair alternator because it is in
trouble
Check and confirm charging circuit
(cable between alternator B terminal
∼
battery)
Measure battery voltage during
operation
Check and confirm that faulty charging warning
lamp circuit functions correctly. (between L terminal
－
emergency controller CN2-11 terminal)
Measure voltage of alternator B
terminal during operation
Normality: About DC28V
Abnormality
: Battery voltage is same
as when stopping
Normality: About DC28V
Abnormality
: Battery voltage is same
as when stopping
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