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TM 9-2350-238-20-1
2-12. ELECTRICAL CIRCUIT TROUBLESHOOTING (CONT).
Step 1.
Set MASTER switch OFF. Remove inoperative lamp from service
headlamp. Refer to page 2-601. Connect multimeter to the parallel lamp
terminals. If multimeter indicates about 1 ohm, go to step 2. If multimeter
indicates infinity, replace lamp. Refer to page 2-601.
Make sure MASTER switch is OFF before repairing electrical
circuits. Failure to observe this warning could result in injury to
personnel.
To access line disconnect, remove hull transmission compartment deck
Step 2.
assembly. Refer to page 2-938. Disconnect lead 514. Place red probe in
lead 514. Ground black probe. Press headlamp dimmer switch for high
beam operation. Set MASTER switch ON. Turn vehicular light switch to
BO DRIVE. Set BO-IR switch to IR. If multimeter indicates about 24 volts,
repair service headlamp assembly. Refer to page 2-601. If multimeter
indicates no voltage, repair lead 514 from line disconnect to headlamp
dimmer switch. Refer to page 2-371. Set MASTER switch OFF. Turn ve-
hicular light switch OFF. Connect lead.
2-266
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