TM-9-2320-280-20-1
TRUCK, UTILITY: M998 SERIES
TECHNICAL MANUAL; UNIT MAINTENANCE; VOLUME 1 OF 3
JANUARY 1996
TM-9-2320-280-20-1 - Page 305 of 888
2-220
Change 2
TM 9-2320-280-20-1
ALTERNATOR
DIAGNOSTIC FLOWCHART
E5
REPLACE REGULATOR
(Para. 4-114). THEN GO TO
STEP 5, Page 2-198.
TEST OPTIONS
STE/ICE Test 89,
(page 2-750)
TEST OPTIONS
STE/ICE Test 10 and 90,
(pages 2-734 and 2-751).
REASON FOR QUESTION
This connection applies full
current loading to field coil.
Alternator current output
should be near maximum.
E6
NO
YES
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 RISE DURING
CONNECTION TO 180 - 220 AMPS?
NO
YES
REPLACE ALTERNATOR,
(Para. 4-109). THEN GO TO
STEP 5, Page 2-198.
FROM E4,
Page 2-218.2
KNOWN INFO
VOLTAGE OUTPUT
INCORRECT
FUSIBLE LINK OK
POSSIBLE PROBLEMS
ALTERNATOR
REGULATOR
WIRING
KNOWN INFO
VOLTAGE OUTPUT
INCORRECT
REGULATOR HAS
ENERGIZING
VOLTAGE
FUSIBLE LINK OK
POSSIBLE PROBLEMS
ALTERNATOR
REGULATOR
REASON FOR QUESTION
As wire 568A is stubbed off,
the voltage from wire 5A on
red terminal signals regulator
to turn on.
NOTIFY
DS MAINTENANCE TO
REPAIR OR REPLACE
WIRING HARNESS.
TURN ROTARY SWITCH TO “RUN”
POSITION. CHECK FOR BATTERY
VOLTAGE AT RED (ENERGIZE)
TERMINAL ON REGULATOR. IS
BATTERY VOLTAGE PRESENT?
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