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ROTOR
INSPECTION
1
Continuity
test
of
rotor
coil
Apply
tester
between
slip ring
of
rotor
If
there is
no
continuity
field
coil
is
open
Replace
rotor
assembly
Fig
EE 43
Continuity
Test
of
Rotor Coil
2
Ground
test
of
rotor coil
Check
continuity
between
slip ring
and
rotor
core
If
continuity
exists
replace
rotor
assembly
because
rotor
coil
or
slip ring
may be
grounded
EE532
Fig
EE 44
Testing
Rotor Coil
for
Ground
INSPECTION
OF STATOR
Continuity
test
Stator
is
normal
when
there
is
continuity
between individual
stator
coil terminals When there
is
no
conti
nuity
between
individual
terminals
cable
is broken
Replace
stator
assembly
jji
c
EE533
Fig
EE 45
Testing
Stator
for
Continuity
CfJ
3
Correct
direction
of
current
flow
for
three sub
diodes
is shown in
Fig
I
EE
50
I
Engine
Electrical
System
2
Ground test
If each
lead
wire
of
stator
coil
including
neutral
wire
is
not
ccnduc
tive
with
stator
core
condition
is
satisfactory
If
there
is
continuity
stator
coil
is
grounded
EE534
Fig
EE 46
Testing
Stator
for
Ground
INSPECTION
OF DIODE
Perform
a
continuity
test
on
diodes
in both
directions
using
an
ohmmeter
There
are
six main
diodes
and three
sub
di o des
attached
to
set
plate
Three
main
diodes
are
attached
to
positive
EEl plate
and
three others
to
negative
8 plate
Three sub
diodes
are
attached
to
terminals
The
continuity
test
should
be per
formed
on
each diode
between the
terminal
and
plate
Conductive direction
1
plate
2
ptate
3
Diode
Fig
EE 47 Conductive Direction
of
Diode
Mode
LT150
Main diode installed
on
jj
plate
is
a
positive
diode which allows
cur
rent to
now from
terminal
to
EEl
plate
only
In other
words
current
does
not
flow from
e
plate
to
terminal
EE
11
g
1
ptate
2
Terminal
Fig
EE 48
lmpecting
P05iti
Diode
EE046
2
Main diode installed
on
Gplate
is
a
negative
diode which
allows current
to
flow from
8 plate
to
terminal
only
In other
words
current does not
flow
from terminal
to
Gplate
1
ptate
2
Terminal
Fig
EE 49
Inspecting Negative
Diode
EE047
Direction
of electric
current
EE650
Fig
EE 50 Sub Diode
If
current
flows
in
both
positive
and
negative
directions
diode is
short
circuited If
current
flows
in
one
direc
tion
only
diode
is in
good
condition
If there
is
a
faulty
main
diode
replace
all diodes
a
an
assembly
See table
These diodes
are
unserviceable
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