TM 9-2350-287-20-12-19. TROUBLESHOOTING CHART (continued).h. LIGHTS (continued).(11 ) ONE OR BOTH BLACKOUT (BO) DRIVE LIGHTSFAIL TO OPERATE. All other lights operate.Initial Setup:Tools/Test Equipment:Equipment Conditions:Digital multimeter (DMM) (Item 13, Appendix I)MASTER switch set to OFF (refer toGeneral mechanic’s tool kit (Item 24,TM 9-2350-287-10).Appendix I)l Lighting switch in BO DRIVE position anddimmer switch set on low beamMaterials/Parts:(refer to TM 9-2350-287-10).Lockwasher (4) (Item 119, Appendix H)NOTEl Instead of using multi meterfor voltagecheck, STE/lCEtroubleshooting,INDIVIDUALBATTERY VOLTAGE TEST-TEST89 maybe performed.l Instead of using multi meterfor continuity check, STE/lCEtroubleshooting, TEST 91 maybe performed.l This procedure can be used for bothBO drive lights.A. 1. Remove four screws and Iockwashers andcover from headlight assembly. DiscardIockwashers.2. Remove light bulb from socket on headlightassembly.3. Place red lead of multimeter in light bulbsocket and ground black lead.4. Turn MASTER switch ON (refer to TM 9-2350-287-10).5. Check for 24 ± 3 vdc.6. Turn MASTER switch OFF (refer to TM 9-2350-287-10).Is voltage indicated?Continued on next page2-172
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