TM 9-2320-361-20 2-15. TEST EQUIPMENT In troubleshooting the electrical system, multimeters will be used to make resistance or continuity tests and voltage or low ampere current tests. Multimeters may be found in the Common No. 1 and No. 2 Unit Maintenance Automotive Shop Sets. ELECTRICAL TROUBLESHOOTING SYMPTOM INDEX MALFUNCTION NO. MALFUNCTION TROUBLESHOOTING PROCEDURE PAGE 1. 2. 3. 4. 5. 6. 7. 8. 9. 10. 11. 12. 13. 14. 15. 16. 17. 18. 19. 20. 21. 22. 23. 24. 25. 26. 27. 28. BATTERY SYSTEM All vehicle electrical systems inoperative . . . . . . . . . . . . . . . . . . . . . . STARTING SYSTEM Starter will not crank . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . Starter motor operates, but engine cranks slowly . . . . . . . . . . . . . . . . CHARGING SYSTEM (60 AMP) No alternator output (generator in left-hand red) . . . . . . . . . . . . . . . . Batteries not charging properly (generator in yellow or right-hand red) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . Batteries hot or boiling, corrected specific gravity of all cells is 1.280 . . . Batteries use excessive water . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . Batteries run down in operation . . . . . . . . . . . . . . . . . . . . . . . . . . . . CHARGING SYSTEM (100 AMP) No alternator output (generator in left-hand red) . . . . . . . . . . . . . . . . Batteries not charging properly (generator in yellow or right-hand red) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . Batteries hot or boiling, corrected specific gravity of all cells is 1.280 . . . Batteries use excessive water . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . Batteries run down in operation . . . . . . . . . . . . . . . . . . . . . . . . . . . . CHARGING SYSTEM (25 AMP) No generator output (generator in left-hand red). . . . . . . . . . . . . . . . . Batteries not charging properly (generator in yellow or right-hand red) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . Batteries run down in operation . . . . . . . . . . . . . . . . . . . . . . . . . . . . LIGHTING SYSTEM Headlight does not operate on low or high beam, or both headlights inoperative . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . Front marker lamp does not light . . . . . . . . . . . . . . . . . . . . . . . . . . . Taillight or clearance lamp does not light . . . . . . . . . . . . . . . . . . . . . . Stoplight lamp does not light . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . Blackout headlamp does not light . . . . . . . . . . . . . . . . . . . . . . . . . . . Front blackout marker lamp does not light. . . . . . . . . . . . . . . . . . . . . Blackout taillight lamp does not light . . . . . . . . . . . . . . . . . . . . . . . . Blackout stoplight lamp does not light . . . . . . . . . . . . . . . . . . . . . . . . Direction signal inoperative . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . All stoplights are inoperative . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . Both direction signals inoperative . . . . . . . . . . . . . . . . . . . . . . . . . . . Turn signals operate incorrectly with turn signal control lever in one or more positions . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2-77 2-79 2-86 2-89 2-94 2-94 2-94 2-94 2-95 2-96 2-97 2-97 2-97 2-98 2-99 2-99 2-101 2-104 2-104 2-105 2-106 2-107 2-108 2-109 2-110 2-116 2-118 2-119 2-75