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Table of Contents
Alternator failure
If the battery,
regulator/
rectifier, leads,
and connec-
tors are
all
good, but there is still
low voltage
or insuf-
ficient
charging
current,
the alternator
may
be defective.
There are
three
types
of al
tern
a
tor failures: short, open
(wire burned out). or
I
oss in rotor magnetism.
A
short
or
open in
the stator coil will
result
in
ei ther
a low outpu
t, or
no
ouipu
t
at
all.
A
loss
in
rotor
magnetism,
which may
be caused by dropping or
hit·
t ing the
rotor,
leaving
it
near an electromagnetic
field
,
or
just
by
aging,
will
result in low
output.
Alternator output test
Before
starting
alternator
outpu
t
test, warm up
the
engi ne to
obtain
actual alternator operating condition.
•Remove
the engine
sprocket
cover
(Pg.
54), and
dis-
connect
the
yellow leads from the stator.
Set the
mult
imeter to the
250V AC
scale,
and connect the
meter
leads
to
the
yellow
leads.
A. Yellow Leads
•S tart
the engine, run it at
the
rpm
given in
Table K3,
and
note the
voltage
reading.
A much lower
reading
than
that
given
in the
table indicates
that
the
alternator
is
defective.
Table K3
Alternator Output
Meter
I
Reading
@ 4,000
rpm
250V
.A.C
I
about
75V
Stator
c-oi/ resistance
check
•Disconnect the
meter
leads
from the
stator
leads.
•Set
the mu ltimeter to
the
x 1
n
range,
and
measure
for continuity between
the yellow
leads.
If
there is
more resistance
than
shown in Table K4,
or
no
meter
reading,
the
stator
coil
has
an
open
and must be
re-
placed.
MAINTENANCE-ELECTRICAL 159
A. Yellow Leads
Table K4
Stator Coil Resistance
Meter
Reading
x
1
n
o.36-0.54
n
•Using
the highest
resistance range
of the multime
ter,
measure
the
resistance
between
each of
the
yel low
leads
an
d
chassis
ground. Any mete.r reading less
than
infinity
(
00 )
indicates a
short,
necessitat
ing
st
ator
replacement.
If the
stator
windings
have
normal
resistance,
but
the voltage check showed
the
alternator
to be
defective,
then the
magnets have probably
weakened,
and
the
rotor
must be replaced.
Regulator/Rectifier
Before
testing the
regu lator/rectifier out
of circuit
,
check
the
charging vol
tage
ahd
alternator
output
voltage.
The
regulator/rectifier
used
on this
motorcycle is a
solid -state
type.
Each function can
be
checked
sepa-
rately,
but the
regulator/
rectifier
must be
replaced
as
a
unit if
ei
ther
func tion
is
faulty.
{I§§]
:~:~vein:~=c~:To:~~g
r~!u~av~i~r~~~~~~
to the regulator/rectifier.
1. Do not disconnect the regulator/rectifier
with the
ignition switch on. This may damage
the
regulator/
rectifier.
2. Do not disconnect the battery leads while the
engine
is
running
.
This may damage the regulator/rectifier.
Rectifier inspection
•With the
ignition switch
turned off, remove the right
side cover,
and
disconnect the
whitei
red
regulator/
rectifier lead
and white connector.

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   Also See for Kawasaki Z250 1981

This manual is also suitable for:

Kz350 1981

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