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) Lift light switch from instrument panel (Para 7-16). (2) Set multimeter select switch to VOLTS DC. (3) Connect positive (+) multimeter lead to rear light switch, terminal 2 (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). (7) Set rear light switch to ON position (TM 10- 3930-669-10). (a)  If  there  are  not  22  to  24  vdc  present, perform   Steps   (8)   through   (10)   below and    repair    wire    24A    (see    schematic Appendix F). (b)   If   there   are   22   to   24   vdc   present, perform   Steps   (8)   through   (10)   below and replace rear light switch (Para 7-16). (8) Set engine switch to off position. (9) Set MAIN POWER switch to OFF position. (10) Set rear light switch to OFF position. 2-173