WEICHAI WD10 Service Manual - page 136
Service Manual for WD10 Diesel Engine
126
b. Check whether
generator output end
B+ to ground voltage is
about 24V (battery
voltage).
a. If B+ terminal to ground voltage is zero,
then check generator to battery positive and
negative circuits for breakover.
b. If B+ terminal to ground voltage is
obviously lower than battery voltage, then
check whether generator to battery positive
and negative circuits are loose or the
battery is damaged.
Recommended detection method: Connect
a 2W indicator lamp to generator B+
terminal and exciting D+/L terminal,
observe working condition of the indicator.
Troubleshooting:
The brightness of indicator lamp is
normal, and it goes out automatically
after engine is started, generator output
voltage is 27~28.5V; it means the
exciting circuit has problem and needs
to be repaired.
The brightness of indicator lamp is
normal, but it doesn’t go out after
engine is started, generator output
voltage is 27~28.5V; it means generator
regulator has problem and needs to be
checked.
The brightness of indicator lamp is
normal, but it doesn’t go out after
engine is started, generator output
voltage is battery voltage; it means there
is fault in generator regulator, rectifier
bridge, stator or inner connectors, and
needs to be repaired or replaced.
b) Low charging voltage