TM 9-2320-280-20-1
ALTERNATOR
2-220 Change 1
KNOWN INFO
POSSIBLE PROBLEMS
VOLTAGE OUTPUT
INCORRECT
FUSIBLE LINK OK
ALTERNATOR
REGULATOR
WIRING
TEST OPTIONS
REASON FOR QUESTION
STE-ICE-R Test 89 (page 2-750).
As wire 568A is stubbed off, the
voltage from wire 5A on red
terminal signals regulator to turn
on.
DIAGNOSTIC FLOWCHART
FROM E3,
Page 2-218
NO
NOTIFY
DS MAINTENANCE
TO REPAIR OR REPLACE
WIRING HARNESS
KNOWN INFO
POSSIBLE PROBLEMS
ALTERNATOR
REGULATOR
VOLTAGE OUTPUT
INCORRECT
REGULATOR HAS
ENERGIZING VOLTAGE
FUSIBLE LINK OK
TEST OPTIONS
REASON FOR QUESTION
STE-ICE-R Test 10 and 90
(page 2-734 and 2-751).
This connection applies full current
loading to field coil. Alternator
current output should be near
maximum.
E4
TURN ROTARY SWITCH TO “RUN”
POSITION. CHECK FOR BATTERY
VOLTAGE AT RED (ENERGIZE)
TERMINAL ON REGULATOR. IS
BATTERY VOLTAGE PRESENT?
E5
DISCONNECT ALTERNATOR-TO-
REGULATOR CABLE. START ENGINE
AND SET IDLE 1200-1500 RPM. USING
15 AMP CAPACITY JUMPER WIRE,
MOMENTARILY CONNECT PIN “A” OF
ALTERNATOR CONNECTOR TO
ENGINE GROUND. DOES CURRENT
AND VOLTAGE RISE DURING
CONNECTION TO 180-220 AMPS?
NO
REPLACE ALTERNATOR,
(Para 4-109). THEN GO TO
STEP 5, Page 2-198
YES
YES
REPLACE REGULATOR
(Para 4-114). THEN GO TO
STEP 5, Page 2-198
