TM 9-2330-275-14&PTable 4-1. Unit Troubleshooting Chart (con’t).ELECTRICAL SYSTEM (con’t).5. SERVICE STOPLIGHTS AND TAILLIGHTSINOPERATIVE (con't).Continued from step CD. Connect IVC to dolly set distribution box. Turntowing vehicle master switch OFF. Disconnectwires 489-21 from both composite taillight as-semblies. Disconnect wire 461-22 from leftcomposite taillight assembly and wire 460-22from tight composite taillight assembly. Turntowing vehicle master switch ON. Engagetowing vehicle service brake. Alternately placered lead of multimeter in center of all discon-nected wires and ground black lead to vehicleframe. ensuring metal-to-metal contact.IS BATTERY VOLTAGE PRESENT AT ALLSOCKET POINTS?wiring harness (para 4-25).E. Turn towing vehicle master switch ON. Re-move taillight cover from taillight assembly, andremove inoperative light bulb(s) from sccket(s).Place multimeter red lead on center contact inlight socket assembly. Do not let red lead touchside of socket. Ground black lead to socketbase, ensuring metal-to-metal contact.IS BATTERY VOLTAGE PRESENT?Replace composite stoplight-taillight assembly (para 4-24).F. Perform continuity test on light bulb by placingred lead of multimeter on bulb base center andblack lead on bulb base exterior.IS CONTINUITY PRESENT?(para 4-24).4-21
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