TM 9-2320-280-20-1
ALTERNATOR
2-224.10 Change 1
KNOWN INFO
POSSIBLE PROBLEMS
VOLTAGE OUTPUT
INCORRECT
ALTERNATOR
REGULATOR
WIRING
TEST OPTIONS
REASON FOR QUESTION
VISUAL
Must know model of alternator to
perform tests.
DIAGNOSTIC FLOWCHART
H
FROM B1,
Page 2-204
NO
SEE NOTE
OPPOSITE PAGE
KNOWN INFO
POSSIBLE PROBLEMS
ALTERNATOR
REGULATOR
VOLTAGE OUTPUT
INCORRECT
REGULATOR HAS
ENERGIZING VOLTAGE
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.
H1
IS THIS A NIEHOFF 400 AMP DUAL
VOLTAGE ALTERNATOR?
H2
START ENGINE AND ALLOW TO IDLE
AT 1200-1500 RPM FOR 2-3 MINUTES.
RECHECK VOLTAGE OUTPUT. IS
ALTERNATOR OUTPUT LESS THAN 26
VOLTS?
NO
IF OUTPUT VOLTAGE IS
OVER 30.5 VOLTS,
REPLACE REGULATOR
(Para 4-5.11)
YES
YES
GO TO H4,
Page 2-224.12
TEST OPTIONS
REASON FOR QUESTION
MULTIMETER
Determine if high or low output
voltage.
H3
IDLE ENGINE AT 1200-1500 RPM.
DOES VOLTAGE ON 14 VOLT OUTPUT
TERMINAL (YELLOW INSULATOR)
MEASURE BETWEEN 13.4-14.6
VOLTS?
NO
IF OUTPUT VOLTAGE IS NOT
CORRECT, REPLACE REGULATOR
(Para 4-5.14) RECHECK VOLTAGE.
IF VOLTAGE IS STILL NOT
CORRECT, REPLACE ALTERNATOR
(Para 4-5.12)
YES
