4.
5.
meter shows a reading hen winding
iS
grounded-replace stator.
Disconnect the stator leads and test each one
with a 12-volt test lamp for grounding. Touch one
probe to the lead and the other probe to a good
ground on the engine. None of the leads should
show a ground, which will be indicated if the lamp
lights.
If
a ground is indicated, replace the stator.
To
test for shorted coils or opened circuits, use an
ohmmeter, set to read the proper range of
resistances; the resistance values are as follows:
Lead
7
to
8
-
.25-ohms
Lead
8
to 9
-
.95-ohms
Lead 9 to
7
-
1.10-ohms
If
the resistance varies over 25 percent from the
above values, install a new stator and check for
i
m p roved perf
c
rm an ce.
Rectifier (Prior to Spec
T):
Completely isolate the
rectifier assembly from the charging circuit by dis-
connecting all four wires. Test each rectifier
separately with an ohmmeter(Figure
65)
ortest 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
WX
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 (Prior to Spec
T):
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 high charge rate at the battery; it should be
about 8-amperes. If the high charge rate is satisfac-
tory
when the regulator is bypassed, either the
regulator or its power circuit is defective. With a 12-
volt test lamp, check input to thevoltage sensitivecoil
at terminal
A.
If the lamp lights, input is okay and the
regulator is defective.
If the charge rate with
6
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 glows red when the alter-
nator is charging.
HEAT
SINK
-
RECTIFIER
TERMINALS
FIGURE
65.
RECTIFIER TESTS (PRIOR
TO
SPEC T)
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