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 relay R1 (Para 7-33). (2) Set multimeter select switch to VOLTS DC. (3) Connect positive (+) multimeter lead to relay R1, terminal 86. (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). (a) If there are not 22 to 24 vdc present, perform Steps (7) and (8) below and repair wire 34 (see schematic Appendix F). (b) If there are 22 to 24 vdc present, wire 34 is OK. (7) Set engine switch to oft position. (8) Set MAIN POWER switch to OFF position. CONTINUITY TEST (1) Set multimeter select switch to OHMS. (2) Check continuity between relay R1, terminal 85 and a known good ground. (a) If there is no continuity, replace relay R1 ground wire (See schematic Appendix F). (b) If there is continuity, relay R1 ground wire is OK. 2-287