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13-10
GROUP
13-CHARGING SYSTEM
16.
Replace the battery earth
cable.
Should the alternator fail to pro-
duce the rated output
it
must be re-
moved from the vehicle for further
tests and repairs.
TESTING THE ROTOR
1.
Test the rotor windings by
connecting an ohmmeter between the
slip rings
(Fig. 12).
If the reading is above speci-
fications, an open circuit is indicated.
FIG. 12- Rotor Winding Test
If the reading is below speci-
fications, short circuited windings
are
indicated.
2. Test the rotor insulation by
using a 12V battery and test lamp
(Fig. 13). Place one prod on a slip
ring, the other on the rotor shaft.
The test lamp should not
light.
TESTING THE STATOR
1. Test the stator windings by
connecting an ohmmeter between
the winding ends
(Fig.
14).
The readings must be even on
each phase
.
High reading indicates open circuit.
Low reading indicates short circuit.
2.
Test the stator insulation by
using a 12V battery and test lamp
between each winding end and the
lamination pack
(Fig.
15). The test
lamp should not light.
FIG. 14- Stator Winding Test
000000
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12V
FIG. 13- Rotor Insulation Test
FIG. 15- Stator Insulation Test
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