16
Yes
Yes
Check for
shorted wires.
No
No
No
Battery is in
good condition.
Charging system
is functioning
properly.
Does voltage
appear on white
wire of voltage
regulator?
Does voltage
appear on
terminal AC of
ignition switch?
Check ignition
switch for
continuity from
terminal AC to
terminal 30.
Engine is not
running.
Attach voltmeter
to negative and
positive posts of
battery.
Does voltmeter
read 12.2 volts
or above?
Test and
recharge battery.
Start engine and
observe battery
voltage at full
throttle.
Is voltage at
battery between
13 and 14.7 volts?
Does
AC
voltage
appear between
the 2 blue wires
from alternator?
A. 10 volts* AC
at idle?
B. 36 volts* AC
at full throttle?
Replace
alternator.
No
No
Yes
Does green wire
on the regulator
plug between the
two blue wires
show ground
when tested
to
battery positive?
Check ground
connection.
Check white wire
and terminals
rom terminal AC
of ignition switch
to voltage
regulator.
No
Yes
Yes
No
Yes
Yes
Is voltage at red
wire of voltage
regulator 13-14
volts?
Replace voltage
regulator.
Check red wire
and terminals
from terminal 30
of ignition switch
to voltage
regulator.
Notes:
1. Voltage tests are performed
with a DC/AC voltmeter.
2. Tests are performed after
regulator fuse is checked.
3. AC voltage tests are performed
with engine at 3600 rpm.
MODEL 718D, 721, 721D, 725
(All Kubota engines)
BATTERY CHARGING SYSTEM
*voltage may vary + or - 3 volts.
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