e40. ONE OR BOTH HEADLIGHTS (HIGH AND LOW BEAM) DO NOT ILLUMINATE Repair wire 3051 from connector P13 to terminal lug TL81 (para 2-40) or replace front lights cable assembly (para 7-74). 2.            TEST OPTIONS            Operational Test     REASON FOR QUESTION                 KNOWN INFO                     POSSIBLE PROBLEMS        START 1. Does one headlight illuminate?            TEST OPTIONS            Operational Test     REASON FOR QUESTION     This test eliminates possible problems and determines where troubleshooting continues.             KNOWN INFO              Nothing.        POSSIBLE PROBLEMS        Faulty front lights cable assembly. Faulty main light switch. Faulty dashboard cable assembly. Faulty relay K8. Faulty relay K7. NO Go to step 3 of this fault. YES Does left headlight illuminate? One headlight illuminates. Main light switch OK. Dashboard cable assembly OK. Relay K8 OK. Relay K7 OK. Faulty front lights cable assembly. If left headlight does not illuminate, wire 3052 is faulty. If right headlight does not illuminate, wire 3051 is faulty. NO YES Repair wire 3052 from connector P19 to terminal lug TL123 (para 2-40) or replace front lights cable assembly (para 7-74). Personnel Required   (2) References   TM 9-4910-571-12&P INITIAL SETUP   Equipment Condition     Engine shut down (TM 9-2320-365-10).      Tools and Special Tools     Tool Kit, Genl Mech (Item 44, Appendix C)     STE/ICE-R (Item 39, Appendix C)     Multimeter, Digital (Item 22, Appendix C) TM 9-2320-365-20-1 2-512          Change 1