TM 10-3930-669-20 WARNING Remove all jewelry such as rings, dog tags, bracelets, etc.  If jewelry contacts battery terminal, a direct short may result in instant heating of tools, damage to equipment, and injury or death to personnel. VOLTAGE TEST (1) Remove front light switch (Para 7-16). (2) Set multimeter select switch to VOLTS DC. (3) Connect positive (+) multimeter lead to front light switch, terminal 6. (4) Connect negative (-) multimeter lead to a known good ground. (5) Set MAIN POWER switch to ON position (TM 10-3930-669-10). (6) Set engine switch to ignition position (TM 10-3930-669-10). (a) If there are not 22 to 24 vdc present, repair wire 25A (see schematic Appendix F). (b) If there are 22 to 24 vdc present, wire 25A is OK. (7) Set engine switch to off position. (8) Set MAIN POWER switch to OFF position. CONTINUITY TEST (1) Set multimeter select switch to OHMS. (2) Set front light switch to MAST position (TM 10-3930-669-10). (3) Check continuity between front light switch, terminals 2 and 6. (a) If there is no continuity, replace front light switch. (b) If there is continuity, go to Step (4) below. (4) Set front light switch to FRONT position. (5) Check continuity between front light switch, terminals 2 and 3. (a) If there is no continuity, replace front light switch. (b) If there is continuity, front light switch is OK. (6) Install front light switch (Para 7-16). 2-165