TM 10-3930-669-20 CONTINUITY TEST (1)   Set multimeter select switch to OHMS. (2)   Check    continuity    between    relay    R2, terminal  85  cavity  and  a  known  good ground. (a)   If there is no continuity, repair relay R2    ground    wire    (see    schematic Appendix F) (b)   If    there    is    continuity,    relay    R2 ground wire is OK. VOLTAGE TEST (1)   Set  multimeter  select  switch  to  VOLTS DC. (2)   Connect  positive  (+)  multimeter  lead  to relay R2, terminal 30 cavity. (3)   Connect negative (-) multimeter lead to a known good ground. (4)   Set     MAIN     POWER     switch     to     ON position (TM 10-3930-669-10). (a)   If    there    are    not    22    to    24    vdc present, repair wire 7 (see schematic Appendix F). (b)   If  there  are  22  to  24  vdc  present, wire 7 is OK. (5)   Set    MAIN    POWER    switch    to    OFF position. 2-127