BLACKOUT DRIVE HEADLAMP CIRCUIT (HEADLAMP ASSEMBLY). (Cont)

TM 9-2350-238-20-1

2-12. ELECTRICAL CIRCUIT TROUBLESHOOTING (CONT).

Make sure MASTER switch is OFF before repairing electrical

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

personnel.

Step 1.

Remove blackout marker assembly from service headlamp. Refer to 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 blackout marker

assembly. If multimeter indicates no voltage, set MASTER switch OFF,

install blackout marker assembly and go to step 2.

2-248