TM 9-2350-287-20-12-19. TROUBLESHOOTING CHART (continued).h. LIGHTS (continued).(12) FRONT BLACKOUT (BO) MARKER LED’S FAIL TOOPERATE. All other lights operate.Initial Setup:Tools/Test Equipment:Equipment Conditions:l Digital multimeter (DMM) (Item 13, Appendix I)l MASTER switch set to OFF (refer to TMl General mechanic’s tool kit (Item 24,9-2350-287-10).Appendix I). Lighting switch in BO MARKER position(refer to TM 9-2350-287-10).NOTEl Instead of using multi meterfor voltagecheck, STE/ICEtroubleshooting, INDIVIDUALBATTERY VOLTAGE TEST-TEST89 maybe performed.l Instead of using multi meterfor continuity check, STE/lCEtroubleshooting, TEST 91 maybe performed.l This procedure maybe used for rightand left marker light.A. 1. Remove four screws and cover from head-light assembly. Remove BO LED from bot-tom socket of headlight assembtl.2. Place red lead of multimeter in LED socketand ground black lead.3. Have assistant turn MASTER switch ON(refer to TM 9-2350-287-10).4. Check for 24 ± 3 vdc.5. Have assistant turn MASTER switch OFF(refer to TM 9-2350-287-10).Is voltage indicated?Replace LED (para 7-31). Verifyproblem is solved.Continued on next page2-178
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