Problem
BATTERY
NOT
CHARGING
NO
LIGHTING
15 Amp System
(see Figure 6-9)
SECTION
6
ELECTRICAL SYSTEMS
AND
COMPONENTS
3 Amp System Service Guide
NOTE:
Always
zero
ohmmeters
on
each
scale
before
testing,
or
inaccurate
readings
will result.
Test
Conclusion
1-With
engine
running
at 3000 rpm,
If
voltage
is
over
28
the
stator
is
OK.
disconnect
battery
charging
lead
from
battery, measure DC voltage
from
charging
lead
to
ground.
2-With
charging
lead
disconnected
If
both resistance readings are low the
from
battery measure resistance
of
the
diode
is
shorted.
lead to
ground.
Now
reverse the
ohmmeter
leads and take the
resistance reading
again-
In one
direction
resistance
should
If
both
resistance readings are high,
read
infinity
ohms
(open
circuit).
the
diode
or
stator
is
open.
With
ohmmeter
leads reversed
some resistance
should
be measured
(about
mid-scale
with
meter
set
atRx1).
3-Cut
the sleeving on the
battery
If
the reading
is
0 ohms,
the
winding
charge
lead
to
expose
the
diode
con-
is
shorted
...
if
infinity
ohms, the sta-
nections.
Check
resistance on the sta-
tor
winding
is
open
or
the lead wire is
tor
side
of
diode
to
ground
(reading broken.
should
be 1 ohm).
1-Disconnect
lighting
lead
from
wir-
If
15
volts
or
more
stator
is
OK-
if less
ing harness. Measure open
circuit
val-
than
15
volts
wiring
may be shorted.
!age
with
AC
voltmeter
from
lighting
lead
to
ground
with
engine
running
at
3000 rpm.
2-Check resistance
of
lighting
wind-
If
0.5 ohms,
stator
is OK; if 0 ohms,
ing
lead
to
ground.
stator
is
shorted;
if
infinity
ohms, the
stator
is
open
or
the lead broken.
A
CAUTION:
The
15
amp
alternator
system
consists
of
three
major
components:
a
ceramic
magnet
ring
which
is
permanently
affixed
to
an
inner
rim
of
the
flywheel,
the
alternator
stator
mounted
on
the
crankcase
and
a rectifier-regulator
unit
which
is
mounted
on
the
#1
side
ofthe
blower
housing.
Use
the
15
Amp
System
Service Guide
when
servicing
the
system.
1.
Make
sure
battery
polarity
is
correct.
Negative
ground
systems
are
used.
2.
Prevent
alternator
leads
(AC) from
touching
or
shorting.
This
could
permanently
damage
the
stator.
3.
Disconnect
leads
at
rectifier-regulator before
electric
welding
is
done
on
equipment
in
com-
mon
ground
with
the
engine.
37
I
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