TM 9-2350-287-20-12-19. TROUBLESHOOTING CHART (continued).h. LIGHTS (continued).(6) MASTER SWITCH INDICATOR LIGHT FAILS TOOPERATE WITH MASTER SWITCH ON. All otherelectrical systems operate.Initial Setup:Tools/Test Equipment:Equipment Conditions:Digital multimeter (DMM) (Item 13, Appendix I)MASTER switch set to OFF (refer to TMGeneral mechanic’s tool kit (Item 24,9-2350-287-10).Appendix I)NOTEInstead of using multimeterfor voltagecheck, STE/lCEtroubleshooting,INDIVIDUALBATTERY VOLTAGE TEST-TEST89 maybe performed.Instead of using multi meterfor continuity check, STE/lCEtroubleshooting, TEST 91 maybe performed.A. 1. Remove lens and light bulb from MASTERswitch indicator lamp socket.2. Place red lead of multimeter in indicatorlight socket and ground black lead.3. Turn MASTER switch ON (refer to TM 9-2350-287-10).4. Check for 24 ± 3 vdc.5. Turn MASTER switch OFF (refer to TM 9-2350-287-10).Is voltage indicated?Replace indicator lamp (para 7-6).Verify problem is solved.B. 1. Install light bulb and lens in MASTER switchindicator lamp socket.2. Remove four screws and cover from driver’sportable instrument panel.Continued on next page2-158
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