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 hour meter, 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). (a)   If    there    are    not    22    to    24    vdc present, repair wire 65 (See schematic Appendix F). (b)   If  there  are  22  to  24  vdc  present, wire 65 is OK. (6)   Set engine switch to off position. (7)    Set    MAIN    POWER    switch    to    OFF position. CONTINUITY TEST (1)   Set multimeter select switch to OHMS. (2)   Check   continuity   between   hour   meter, terminal (-) and a known good ground. (a)   If   there   is   no   continuity,   replace hour meter ground wire. (b)   If  there  is  continuity,  replace  hour meter (Para 7-10). (3)   Install instrument panel (Para 7-8). 2-157