TM 9-2320-280-20-1
ALTERNATOR
2-222 Change 1
TEST OPTIONS
REASON FOR QUESTION
Visual
Must know model of alternator to
perform proper tests.
DIAGNOSTIC FLOWCHART
NO
SEE NOTE ON
OPPOSITE PAGE
POSSIBLE PROBLEMS
NO
YES
F3
STOP ENGINE. DISCONNECT WIRE
568A FROM ALTERNATOR WIRE 568.
TURN ROTARY SWITCH TO "RUN".
MEASURE VOLTAGE AT THE WIRE
THAT IS NOT CONNECTED TO THE
ALTERNATOR. IS THERE BATTERY
VOLTAGE?
WIRING
ALTERNATOR
REGULATOR
NOTIFY DS TO REPAIR OR
REPLACE WIRE HARNESS
GO TO F4,
Page 2-224
STE-ICE-R Test 89
(page 2-750)
KNOWN INFO
TEST OPTIONS
KNOWN INFO
POSSIBLE PROBLEMS
WIRING
ALTERNATOR
REGULATOR
VOLTAGE OUTPUT
INCORRECT
TEST OPTIONS
REASON FOR QUESTION
1. STE/ICE-R TEST 10 AND 89
(Pages 2-734 and 2-750).
Determine if high or low output
voltage.
F1
IS THIS A NIEHOFF 100 AMP
SINGLE VOLTAGE ALTERNATOR?
F2
START ENGINE AND ALLOW TO IDLE
AT 1200-1500 RPM.
RECHECK VOLTAGE OUTPUT.
IS ALTERNATOR OUTPUT LESS
THAN 26 VOLTS?
YES
IF OUTPUT VOLTAGE IS
OVER 30.5 VOLTS,
REPLACE REGULATOR
(Para 12-22)
NO
REASON FOR QUESTION
YES
Wire 568A and wire 568 carry
ignition current to turn on
regulator.
VOLTAGE OUTPUT
INCORRECT
F
FROM B1,
Page 2-204
