HEADLAMP BLACKOUT MARKER CIRCUIT. (Cont)

TM 9-2350-238-20-1

2-12. ELECTRICAL CIRCUIT TROUBLESHOOTING (CONT).

Remove inoperative blackout marker lamp from service headlamp. Refer to

Step 1.

page 2-601. Set MASTER switch ON. Set panel light switch ON. Unlock

main light switch and place in blackout drive position. Place blackout

infrared selection switch in blackout position. Place red probe in socket.

Ground black probe. If multimeter indicates about 24 volts, replace lamp. If

multimeter indicates no voltage, set MASTER switch OFF, install lamp and

go to step 2.

Make sure MASTER switch is OFF before repairing electrical

circuits. Failure to observe this warning could result in injury to

personnel.

Step 2.

To access line disconnect, remove transmission deck lid assembly. Refer

to page 2-938. Disconnect lead 20. Place red probe in lead 20. Ground

black probe. Set MASTER switch ON. Turn vehicular light switch to 60

MARKER. If multimeter indicates about 24 volts, repair service headlamp

assembly. Refer to page 2-601. If multimeter indicates no voltage, repair

lead 20 between line disconnect and vehicular light switch. Refer to page

2-371. Set MASTER switch OFF. Turn vehicular light switch OFF.

Connect lead.

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