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. CONTINUITY TEST (1) Remove cab light lamp (Para 7-32). (2) Set multimeter select switch to OHMS. (3) Check continuity across lamp terminals. (a)   If   there   is   no   continuity,   replace lamp. (b) If there is continuity, lamp is OK. (4) Install cab light lamp. VOLTAGE TEST (1) Remove cab light (Para 7-32). (2) Set multimeter select switch to VOLTS DC. (3) Connect positive (+) multimeter lead to cab light wire 36 terminal. (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, perform Steps (5) through (7)  below  and  repair  light  wire  36 (see schematic Appendix F). (b)  If  there  are  22  to  24  vdc  present, perform   Steps   (5)   and   (7)   below and replace light ground wire (See schematic Appendix F). (5) Set engine switch to off position. (6)   Set   MAIN   POWER   switch   to   OFF position. (7) Install cab light. 2-191