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 TM 55-1905-221-14-1
4-28.
ALTERNATORS (Continued).
Location/Item
Action
Remarks
TEST (Cont)
f.
With engine running, check
dc voltage across positive
and negative output terminals.
Correct voltage at positive
output terminal should be 1.0
volt less than measured in e
above. If voltage difference
exceeds 1.0 volt, isolation
diode is defective. Notify
your supervisor.
g. Stop engine and disconnect
voltage regulator. Place
jumper wire across auxiliary
and field terminals. With
engine running at idle, check
dc voltage across auxiliary
and negative output terminals.
Correct voltage is 29.4+0.2
volts. If voltage was low in
e above and now rises to
correct voltage, regulator is
defective. Notify your
supervisor. If voltage
remains low, alternator is
defective. Notify your
supervisor.
4-104
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