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ALTERNATOR AND REGULATOR
8-35
NOTE: Cut the stator connection as close to the
connector as possible because they will have to
be
soldered together again. If they are cut too short it
may be difficult to get them together again for
soldering.
(b) Test the rectifiers with a
12
volt battery and a
test lamp equipped with a number
67
bulb
(4
candle
power) by connecting one side of test lamp to the
positive battery post; the other side of the test lamp
to a
test
probe with the other test probe connected to
the negative battery post.
(c) Contact the outer case of the rectifier with one
probe and the other probe to the wire in the center
of the rectifier (Fig.
21).
(d) Reverse the probes, moving the probe from the
rectifier outer case to the rectifier wire, and the probe
from the rectifier wire to the rectifier outer case.
If the test lamp "lights" in one direction but does
"not light" in the other direction, the rectifier is sat-
isfactory. If the lamp lights in "both directions," the
rectifier
is "shorted." If the test lamp does "not light"
in either direction, the rectifier is "open."
NOTE: Possible cause of an open or a blown recti-
fier is a faulty capacitor or a battery that has been
installed in reverse polarity.
If the battery
is
in-
stalled properly and the rectifiers are open, test the
capacitor capacity-30
microfarad (plus or minus
20%).
(e) Unsolder the rectifier leads from the stator
leads.
(f)
Test the stator for grounds using a
110
volt
test
lamp (Fig.
22).
Use wood slats to insulate the stator
from the rectifier shield. Contact one prod of the test
lamp to the stator pole frame, and contact the other
prod to each of the three stator leads. The test lamp
should "not light." If the test lamp lights, the stator
windings are "grounded."
(g) Test the stator windings for continuity, by con-
-------
T O
110
VOLT
POYER SOURCE
/
NK113
Fig. 23-resting
Stator Windings for Continuity
tacting one prod of the test lamp to
all
three stator
leads at the
"Y"
connection. Contact each of the three
stator leads (disconnected from the rectifiers). The
test lamp should "light" when the prod contacts
each of the three leads. If the test lamp does not light
the stator winding is "open" (Fig.
23).
(h) Install
a
new stator if the stator tested is
"grounded" or "open." If the rectifiers must be re-
placed unsolder the rectifier wire from the stator lead
wire at the soldered joint.
NOTE: Three rectifiers are pressed into the heat
sink and three in the end shield. When removing
the rectifiers, it is necessary to support the end
shield and/or heat sink to prevent damage to these
castings.
(4)
Cut the lead at the malfunctioning rectifier.
( 5 )
Place the Rectifier Removing and Installing Press
in a vise and support the end shield on the clamp an-
vil under the rectifier to be removed (Fig.
24).
FIXTURE
\
Fig. 22-resting
the Stator for Grounds
Fig. 24-Removing
Rectifiers
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