TM 10-3930-653-14&P Set the variable resistor to the "MAX" position. Apply current   (turn   on   these   witch),   and   reduce   resistance gradually. When resistance is reduced to a certain level. the charge lamp goes off. This    level    indicates    the    charge    relay    operating voltage.  The  rated  value  is  3.7  to  5.7V  volts.  When  not correct.  readjust.  The  adjustment  is  carried  out  in  the same manner as the voltage regulator Fig. 4-204.  Charge Relay Operating Voltage Measuring Circuit (3)   PRECAUTIONS FOR ADJUSTMENT (1)   Upon  completion  of  adjustment,  reinstall  cover  and make sure that regulator operates correctly. (2)   When    cover    is    removed    or    adjusting    screw    is adjusted  while  adjusting  voltage.  be  sure  to  disconnect the   regulator   at   once,   and   reconnect   when   actually measuring    or    battery    circuit    may    be    short-circuited. 4-113