TM 9-2320-280-20-1
ALTERNATOR
2-224.2 Change 1
DIAGNOSTIC FLOWCHART
F.1
FROM B1,
Page 2-204
REPLACE REGULATOR
(Para 4-5.6). THEN GO TO
5, Page 2-198
KNOWN INFO
POSSIBLE PROBLEMS
WIRING
ALTERNATOR
REGULATOR
VOLTAGE OUTPUT
INCORRECT
TEST OPTIONS
REASON FOR QUESTION
STE/ICE-R TEST 10,
(interleave with control
function 01 of page 2-734
then 89, page 2-750)
Determine if high or low output
voltage.
F.1-2
START ENGINE AND ALLOW TO IDLE
AT 1200-1500 RPM FOR 2-3 MINUTES.
RECHECK VOLTAGE OUTPUT.
IS ALTERNATOR OUTPUT LESS THAN
26 VOLTS?
YES
IF OUTPUT VOLTAGE IS
OVER 30.5 VOLTS,
REPLACE REGULATOR
(Para 4-5.6)
NO
TEST OPTIONS
REASON FOR QUESTION
Visual
Must know model of alternator to
perform proper tests.
NO
SEE NOTE ON
OPPOSITE PAGE
F.1-1
IS THIS A NIEHOFF 100 AMP DUAL
VOLTAGE ALTERNATOR?
YES
KNOWN INFO
POSSIBLE PROBLEMS
ALTERNATOR
REGULATOR
WIRING
VOLTAGE OUTPUT
INCORRECT
REGULATOR HAS
ENERGIZING VOLTAGE
TEST OPTIONS
REASON FOR QUESTION
STE/ICE -R TEST 10 AND 90
(pages 2-734 and 2-751)
This connection applies full
current loading to field coil.
Alternator current output should
be near maximum.
F.1-3
DISCONNECT ALTERNATOR-
TO-REGULATOR CABLE. START
ENGINE AND SET IDLE 1200-1500 RPM.
USING 15-AMP CAPACITY JUMPER
WIRE, MOMENTARILY CONNECT TO
ENGINE GROUND. DOES CURRENT
AND VOLTAGE RISE DURING
CONNECTION?
YES
REPLACE REGULATOR
(Para 4-5.6). THEN GO
TO 5, Page 2-198
NO
