TM 10-4320-307-24
3-21
ALTERNATOR REPAIR (CONT).
TEST:
1.
Perform stator ground test by checking each of three stator leads to ground. If a low resistance is indicated, the
stator is grounded and must be replaced.
2.
Perform stator phase resistance test by checking resistance between each of the stator terminals 1 and 2. 2 and 3,
and 1 and 3.
Resistance shall be between 0.115 ohm and 0.125 ohm. If resistance values measured are not
within tolerances, stator must be replaced.
3.
Check
diodes
in
rectifier
assemblies
by
using
ohmmeter. Check resistance by reversing ohmmeter
leads between rectifier eyelets and rectifier case.
Resistance should be high in one position and low in
the other. Replace diode assembly if resistance
readings observed are not as stated.
4.
Perform
rotor
coil
resistance
test
by
checking
resistance between slip rings and ground. If a low
resistance is observed, the rotor assembly must be
replaced.
5.
Perform rotor coil resistance test by connecting
ohmmeter test leads to slip rings. Resistance
measurement should be between 12.5 ohms and 13.5
ohms. Replace rotor assembly If resistance readings
observed are not as stated.
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