Rectifier:
Completely isolate the rectifier assembly
from
the charging
circuit
by disconnecting all four wires. Test
each
rectifier
separately
with
an ohmmeter
(Fig.
lO-'S)
or
test
lamp.
With
an ohmmeter, connect one
test
lead to the rectifier
lead and the other
test
lead to the rectifier
base.
Take the
reading and then
reverse
the
test
probes. If the rectifier is
good, one reading
will
be much higher than the other.
If
a
test
lamp is
used,
touch the
test
probes
together and
observe
the brightness of the bulb. Then touch the
probes
across
the rectifier. If the rectifier is good, the bulb
will
light
dimly.
If the bulb lights
brightly
or not at all, the
rectifier
is defective and must be replaced.
Voltage
Regulator: If the low
rate
charge
is satisfactory,
but high
rate
is not, connect a jumper between terminals B
and C. Run the engine and check the
charge
rate
at the
battery; it should be about
8-amperes.
If it is, either the
regulator or its power
circuit
is defective.
With
a 12-volt
test
lamp, check input to the voltage sensitive
coil
at
terminal
A..If
the lamp
lights,
input is okay and the regulator
is defective.
If
the
charge
rate
with
B and C jumpered is low, look to the
alternator or its
wiring
for
the
cause.
Indicator
Light:
This
light
is
used
on
engines
with
factory
mounted controls.
Light
mounts on
rear
cylinder air housing
and lights red when alternator is charging.
Models
Beginning
With
Spec
T
BATTERY
CHARGING
The battery
charge
voltage furnished by the
flywheel
alternator is regulated by
solid
state
rectifiers
with
the
combination
regulator-rectifier mounted on the blower
housing. See Figure 10-4. There is no adjustment in the
regulator. Maintenance
consists
of keeping the heat-sink
fins
clean at all times to permit
adequate
cooling. The
following
is a
list
of do's and don'ts.
1.
Do Be
Sure
Output Control Plug - (Connector) is pro-
perly
inserted in the stator receptacle. This
means
the
plug
must push into and
solidly
bottom in the
receptacle
so as to eliminate any
resistance
due to a poor con-
nection.
Keep it clean and tight.
2.
Do Be
Sure
the Output Control (Regulator) has a good
clean ground connection to
operate
properly. This
means
the mating surface where the control unit mounts
on
the housing must be clean and. fastening bolts
tightened properly.
3. Battery - Don't
reverse
battery
leads.
Reverse
polarity
will
destroy the output control.
FIG.
10-4
28
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