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 TM 55-1905-221-14-2
5-12.1.
ALTERNATOR (Continued)
LOCATION/ITEM
ACTION
REMARKS
TESTING (Cont)
NOTE
Disconnect jumper wire after testing.
c. With propulsion unit or
engine running, check
voltage across auxiliary
and negative output ter-
minals with DC voltmeter.
Correct voltage is 29.4
0.2 volts. If voltage
Ts low, proceed with
tests.
d. With engine running, check
voltage across positive
and negative output terminals
with DC voltmeter. Correct
voltage at positive output
terminal is 1.0 volt less
than voltage in c. above.
If voltage difference
exceeds 1.0 volt, isolation
diode is defective.
e. Stop engine and disconnect
voltage regulator. Place
jumper wire across auxiliary
and field terminals. With
engine running at idle,
check voltage across
auxiliary and negative
output terminals. Correct
voltage is 29.4 0.2 volts.
If voltage was low in c.
above, and now rises to
correct voltage, regulator
is defective and shall be
replaced. If voltage
remains low, alternator
is defective.
5-157
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