Figure 11-28. Testing Rotor for Ground
Figure 11-29. Testing Rotor for Shorts
c.
Stator: The stator can be tested for open or grounded windings with a 12-volt test bulb, described in
the rectifier section, or an ohmmeter, in the following manner. Separate the stator from the slip ring
end head just far enough to insert a fold of rags or blocks of wood. In other words, insulate the stator
from the end head. To test for grounded windings, touch one test bulb or ohmmeter probe to the
auxiliary terminal or any stator lead and the other test bulb or ohmmeter probe to the stator frame. If
the test bulb lights, or the ohmmeter indicates continuity, the stator is grounded. To test for open
windings, connect one test probe to the auxiliary terminal or the stator winding center connection and
touch each of the three stator leads. The test bulb must light or the ohmmeter must show continuity.
Due to the low resistance in the stator windings, shorted windings are almost impossible to locate.
H o w e v e r, shorted stator windings will usually cause the alternator to “growl” or be noisy during
operation and will usually show some signs of overheating. If all other electrical checks are normal
and alternator fails to supply its rated output, the stator should be replaced to determine whether or not
it is the faulty component.
d. Bearings and Seals: Whenever the alternator is overhauled, new bearings and oil or grease seals are
recommended, even though the bearings and seals appear to be in good condition. A faulty seal can
cause an alternator to fail within a very short period of time.
11-39. ASSEMBLY OF ALTERNATOR.
a.
Press the ball bearing into the drive end head using a flat block approximately two inch square so that
the pressure is exerted on the outer race of the bearing. Install the retainer plate. With the snap ring and
retainer cup in place on the rotor shaft, use a tool that fits over the shaft and against the inner bearing
race, and press until the inner bearing race is against the snap ring retainer cup. (Refer to Figure 11-
30.)
b. Carefully install the rectifiers in the slip ring end head or rectifier mounting plate by supporting the
unit and using the special tools illustrated in Figure 11-31.
Revised: 2/13/89
2H15
CHEROKEE ARROW III SERVICE MANUAL
ELECTRICAL SYSTEM
Summary of Contents for ARROW III
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