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 lower and upper column covers (Para 7-21). (2)  Set  multimeter  select  switch  to  VOLTS DC. (3)  Connect  positive  (+)  multimeter  lead  to glow plug switch wire 29 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. (a) If there are not 22 to 24 vdc present, perform Steps (7) and (8) below and repair or replace wire 29 (see schematic Appendix F). (b)  If  there  are  22  to  24  vdc  present, wire 29 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 glow plug switch. (3)    Check    continuity    across    glow    plug switch. (a) If there is no continuity, replace glow plug switch (Para 7-13). (b)  If  there  is  continuity,  repair  wire  31 (see schematic Appendix F). (4)  Install  lower  and  upper  column  covers (Para 7-21). 2-241