TM 9-2320-280-20-1
ALTERNATOR
2-218 Change 1
TEST OPTIONS
REASON FOR QUESTION
Visual
Must know model of alternator to
perform proper tests.
DIAGNOSTIC FLOWCHART
E
FROM B1,
Page 2-204
NO
SEE NOTE ON
OPPOSITE PAGE
POSSIBLE PROBLEMS
NO
YES
E3
STOP ENGINE. CHECK FOR
BURNED OR BROKEN REVERSE
POLARITY FUSIBLE LINK ON
ALTERNATOR OUTPUT STUD. IS
FUSIBLE LINK OK?
FUSIBLE LINK
WIRING
ALTERNATOR
REGULATOR
GO TO E4,
Page 2-220
Visual
KNOWN INFO
TEST OPTIONS
KNOWN INFO
POSSIBLE PROBLEMS
FUSIBLE LINK
WIRING
ALTERNATOR
REGULATOR
VOLTAGE OUTPUT
INCORRECT
TEST OPTIONS
REASON FOR QUESTION
STE/ICE-R Test 10 and 89
(Pages 2-734 and 2-750).
Determine if high or low output
voltage.
E1
IS THIS A NIEHOFF 200 AMP SINGLE
VOLTAGE ALTERNATOR?
E2
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 4-114) or (Para 4-115)
NO
REASON FOR QUESTION
YES
VOLTAGE OUTPUT
INCORRECT
Fusible link connects alternator
output stud to wire 6.
REPLACE FUSIBLE LINK.
GO TO STEP 5,
Page 2-198
