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 221 of 1176

TM 9-2320-361-24-1

0013 00

0013 00-9

LIGHTING AND WIPER SYSTEM TROUBLESHOOTING (Contd)

MALFUNCTION

TEST OR INSPECTION

CORRECTIVE ACTION

2. B.O. LIGHT

MARKER LAMP

DOES NOT LIGHT

Test 1. Test battery voltage at front

marker light.

1. Turn main light switch to OFF

position.

2. Disconnect lead 20 at rear of

front composite light on side of

vehicle where light is

malfunctioning.

3. Place main light switch lever

in B.O. MARKER or B.O.

DRIVE position.

4. Check for battery voltage at

contact end of lead 20.

Test 2. Test continuity of filament in

B.O. marker lamp.

Set multimeter to RX 1 scale. Check

continuity between frame ground and

lead 20 attached to rear of B.O.

marker lamp.

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, and check

front wiring harness pin E.

1. If continuity is not present, replace

B.O. marker lamp (WP 0122 00).

2. If continuity is still not present,

check for corroded contacts at lamp

and at lead 20 connection to front

wiring harness. Reconnect lead 20.

MAL 2

TEST 2

MAL 2

TEST 1

STEP 4

MAL 1

TEST 2

MAL 1

TEST 1

STEP 4

PARKING LAMP

B.O. DRIVE

LAMP

B.O.

MARKER

TURN

SIGNAL

20

20

19

Table 2. Blackout Lights (B.O.)

Troubleshooting Procedures (Contd).