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Kawasaki KZ1300-A1 Quick Reference Manual Page 234

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MAINTENENCE--ELECTRICAL
When the battery voltage is lower than the specified
value,
the zener diode does not conduct and the control
unit does not trigger the
thyristor.
At this ti me, the
thyristor does not conduct, and all alternator output
current flows through the battery and loads to supply
adequate charging current.
When the battery voltage is eq ual to or higher than
the predetermin ed voltage, the zener diode conducts and
the control unit signals the thyristor to start conducting.
Then, instead of current
going
throu gh the battery and
overcharging it, it
flows
throu gh the thyristor and then
directly back to
the alternator.
There are a number of important precautions that
are musts when servicing the charging system. Cautions
that
app
ly to the individual parts are listed
below.
Failure to observe these rules can result in serious
system damage. Learn and observe all the rules
below.
~ :b~:~e h:~:Ii;~IO=i~9 r;:u~::~r~~:~~~
to the
regulator/ rectifier:
1.
Do not reverse the battery lead connections. This
will burn out the zener diode.
2.
For the regulator/rectifier to function
properly,
the battery must be charged to near
capacity.
If
the battery is badly discharged, charge it before
installing it in the
motorcycle.
When handling the alternator rotor:
3. The
alternator rotor
should
never
be struck
sharply,
as with a
hammer,
or allowed to fall on a hard
surface.
Such a shock to the rotor can cause the magnets to
lose their
magnetism.
Charging System Inspection
Initial inspection:
I f there are any problem indications in the charging
system
,
give the system a quick initial
inspection
or
check before starting a
series
of time consuming
tests,
or worse yet, removing parts for repair or replacement.
Such a check will often turn up the source of the trouble
.
Make sure
all
connectors in the circuit are clean
and tight. Examine wires for signs of
burning,
fraying,
etc
.
Poor wires and bad connections will affect electrical
system
operation
.
Check the alternator rotor and
regulator/rectifier for evidence of physical damage.
A worn out or badly sulphated battery will produce
numerous problems that cannot be corrected until the
battery is replaced
.
ALWAYS CHECK BATTERY
CONDITION BEFORE CONDEMNING OTHER PARTS
OF THE SYSTEM. A FULLY CHARGED BATTERY
IS A MUST FOR CONDUCTING ACCURATE
CHARG-
ING SYSTEM
TESTS.
Charging system malfunctions can be traced to
either the battery,
alternator,
regulator/rectifier, or
the wiring. Troubles may involve one item or in some
cases all items. Never re place a defective part without
determining what
CAUSED
the failure
.
If the failure
was brought on by some other item or items, they too
must be
repaired
or replaced, or the new replacement
will soon fail again
.
Operational inspection
of
charging
system:
-
Warm
up
the engine
to
obtain actual alternator opera-
ting
co nditio
ns.
-
Remove the
right
side cover, and pull out the 4-pin
connector which connects the
regulator/rectifier
and
the main wiring
harness.
-
Check that the ignition switch
is
turned off, and con-
nect the multimeter as shown in Table
K2
to test the
regulator/rectifier output voltage at the 4-pin connector.
~ ::~h:h~:~:~ ~:~it::ec~~~~::~i:~;:~~~
when the ignition switch
is off,
so take care not to short
the
met
er probes or
clips
to
the
chassis ground.
A.
Regulator/Rectifier
B. 4-pin Connector
Regulator/
Rectifier Output
Voltage Measu rement
Regulator/
Rectifier
+
Battery
.'----~DC
Voltmeter
~
-
Start the
engine,
and note the
voltage readings at
various engine speeds with the headligh't turned on
and then turned off.
(To
turn off the headlight of
US model disconnect the black/yellow lead
from
the
headlight unit
in
the headlight
housing.)
The
readings
should
show nearly battery voltage when the engine
speed
is
low, and
,
as the engine speed rises, the readings
should
also rise
.
But they must be kept under the
specified voltage
.
-
Turn off the
ignition switch
to stop the
engine,
and
disconnect the multimeter.
If the
regulator/
rectifier output voltage are kept
between the values given
in
Table K2
,
the
charging
system is considered to be working normally
.
If the output voltage
is
much higher than the values
specified in the table, the
regulator/rectifier
is defective
or the
regulator/rectifier
leads
are
loose or open.
If the battery voltage does not rise as the engine
speed increases, then the
regulator/
rectifier is
defective
or the alternator output
is insufficient
for
the
loads.
234

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