TM-9-2320-361-24-1
2-1/2 TON, 6X6, M44A2 SERIES TRUCKS
TECHNICAL MANUAL; FIELD AND SUSTAINMENT MAINTENANCE PART 1 OF 2
AUGUST 2006
TM-9-2320-361-24-1 - Page 220 of 1176
TM 9-2320-361-24-1
0013 00
0013 00-8
LIGHTING AND WIPER SYSTEM TROUBLESHOOTING (Contd)
MALFUNCTION
TEST OR INSPECTION
CORRECTIVE ACTION
1. B.O. HEADLAMP
DOES NOT LIGHT
Test 1. Test battery voltage at B.O.
drive light.
1. Place main light switch lever
in OFF position.
2. Disconnect lead 19 from B.O.
drive light.
3. Turn main light switch to B.O.
DRIVE position.
4. Check for battery voltage on
contact end of lead 19.
Test 2. Test continuity of filament in
B.O. drive light.
Set multimeter to RX 1 scale. Check
continuity between frame ground and
lead 19 attached to rear of B.O. drive
light.
1. If battery voltage is present, go to
test 2.
2. If battery voltage is not present go
to WP 0013 00, table 1, malfunction
1, test 3.
1. If continuity is not present, replace
B.O. drive lamp (WP 0123 00).
2. If continuity is present, check for
corroded contacts at lamp and at
lead 19 connection to front wiring
harness. Reconnect lead 19.
R.H. FRONT COMPOSITE LIGHT
B.O. DRIVE
L.H. FRONT COMPOSITE LIGHT
R.H. REAR COMPOSITE LIGHT
L.H. REAR COMPOSITE LIGHT
LIGHT
SWITCH
B
D
OFF
75 STOPLIGHT OPEN
75 STOPLIGHT
23
24
21
22-460-461
24
23
20
STOPLIGHT SWITCH
20-483-484
20-24 B.O. TAILLIGHT
20-483-484
15 (BATTERY)
—491-
460-461-
491-
461-
B.O.
MARKER
B.O.
MARKER
B.O.
TAILLIGHT
B.O.
STOPLIGHT
B.O.
TAILLIGHT
B.O.
STOPLIGHT
VAN BODY
B.O.
CLEARANCE
B.O.
MARKER
B.O.
DRIVE
F
A
K
N
E
D
Table 2. Blackout Lights (B.O.) Troubleshooting Procedures.
HARNESS
CONNECTOR
X
X
X
X
X
X
X
~
~
~
~
19
19
B.O. DRIVE
~
~
X
X
X
X
21
22-460-461
24
23
X
X
X
X
~
~
-490
X
24-
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