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ALTERNATOR CHARGING SYSTEM
IntpRtlon on the
W'INcIe
When the warning light
Indicates something
wrong
or incovenlenc:es
in the charging
system
it is
necessary to carefully inspect the system
itself.
A
first
check
Is possible without removing the
alternator
from
the
motorcycle.
but with the en-
gine
in
sufficient cool condition
to allow a
safe
access
to
the
alternator.
Taking proper
cautions,
detach the
cable .B .. (red
wire,
positive
rectifier
plate)
connecting an
amperometer or
voltmeter
accord
ing diagram
fig
. 370.
Start
the
engine.
Check this connecting on
whichever fed
device,
for example on
the
headlight.
then read
charge
and relative
voltage.
If
the
reading results in 10
+
14 A with 12
or
13 V
the alternator
working
will be considered
as
regular.
Consequently
the trouble
cause is to
be found
elsewhere.
Carefully
inspect all
connections,
particularly
the
warning light
circuit
and the wi-
ring to regulator and
rectifier.
If
the troubles perSist
in
spite
of
having found
no defective connection or having
repaired the
defective ones,
proceed
to following
checking
.
Test 01
a
poslttve diode by
means
of
an
..
Ohmmeter.
(fig.
371)
Connect the Ohmmeter
positive
point
to the
diode, anode,
then the
other
Ohmmeter
point to
the diode
cathode;
thus bringing the diode
to
conduction
.
The
Ohmmeter
Ind
icator
must firmly shift
tow-
ards the
first
sector
of
the Ohmmeter dial.
By reversing the above point
connections, the
diode is brought to stopping
and
the indicator
does not
move.
For
Ohm
values,
see fig
.
372 and
373.
Test
of •
neg.ttYe
dtode
by me.n.
of
an ..
Ohmmete,.
Connect
the Ohmmeter positive point to the
diod
e
anode,
then
the other Ohmeter point to
the diode cathode
;
thus bring ing the diode
to
conduction
.
The
Ohmmeter
Indicator must
firmly
shift
towards
the
first sector of the OhmeHer
dial.
192
By
reversing
the above
po int
connections,
the
diode
is
brought
to stopping and the indicator
does
not
move.
For
Ohm
values,
see
fig.
372 and
373.
Telt of
an exciting
diode by meana
of an
..
Ohmmeter
..
This piece acts
as
a positive
diode.
By connect
ing the Ohmmeter positive point to
the diode
anode
and the
other Ohmmeter point
to
the diode
cathode,
the
Ohmmeter
ind icator
immediately sh
ift
to
the
first
sector
of the
Ohm-
meter dial. By reversing the
connection
the
diode
stops
and the Ohmmeter
Indicator does
not
move.
For
Ohm
values, see
fig
.
372 and 373.
In case
a defective
diode
Is
detected,
it
will
be necessary to replace the whole diode
plate.
Teat 01
stator
winding
,....
...
nce
(fig.
374)
Delach all the alternator wiring
..
DB
.
and
..
OF-
and
the
pin
connection ..
U
-
V - W-
.
This test can
be carried
out
by
means
of a com-
mon
..
Ohmmeter. or
by means
of
a unit
for
al-
ternator
lesting.
The
stator winding resistance has to be
measur-
ed between
the
phase
outlets ..
U - V
-
-
•
.
The
three measurements shall
be equal.
Stator
3-phase
wind ing resistance
(A.C.):
0,5 Ohm
.....
100/0
Telt of rotor winding re.l.laInce
(fig.
375)
By means
of
an
.. Ohmmeter.,
measure the rotor
exiting winding resistance with scratched
poles.
It
must
result
In this
value:
4,0 Ohm
.....
10%
(see
fig
. 375).
By means
of an
..
Ohmmeter_,
measure
the
rotor
exiting
windi
ng resistance with scratched
poles.
It must
result In th is value
:
4,0 Ohm
.....
100/0
(see
fig.
375)
.
AHer
regrinding on
a turning
machine,
check
the
concentric conditions of
commutators (see
fig.
376)
.
Max
.
permissi
ble
excentricity
:
mm 0,03
Min.
commutator
0:
mm 31 ,5
Max.
permissible tolerance
,
pole wheel
:
mm
0,05
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