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)  Set  multimeter  select  switch  to  VOLTS DC. (2)  Connect  positive  (+)  multimeter  lead  to brake switch wire 27 terminal. (3) Connect negative (-) multimeter lead to a known good ground. (4)    Set    MAIN    POWER    switch    to    ON position (TM 10-3930-669-10). (5)   Set   engine   switch   to   ignition   position (TM 10-3930-669-10). (6) Check for voltage. (a)   If   there   are   not   22   to   24   vdc present, perform Steps (7) and (8) below   and   replace   wire   27   (See schematic Appendix F). (b)  If  there  are  22  to  24  vdc  present, wire 27 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) Depress brake pedal. (3) Check continuity across brake switch. (a)   If   there   is   no   continuity,   replace brake switch (Para 7-18). (b) If there is continuity, repair wire 27A (see schematic Appendix F). 2-203