TM 5-6115-275-14 NAVFAC P-8-615-14 TO 35C2-3-452-1 Figure 4-66.  Access cover’s, removal and installation (Model MEP-023A). 4-42. Voltage Regulator a. General.  The voltage regulator is a universal type   designed   for   DOD   model 3KW,  5KW  and  10KW  generator sets. b. Testing.  Determine if the voltage regulator is defective   by   performing   voltage regulator    on-equipment    test    as described below: (1) Put    output    selector    switch    on desired   setting   (figure   2-6)   and disconnect load cables. (2) Start  the  generator  set  (fig.    2-7). Place   the   circuit   breaker   to   the ON   position   and   check   output selector   switch   for   indication   of load terminals where output voltage is applied. (3) Check   set   voltmeter   for   correct setting. Using   a   multimeter,   check   load   terminals   to   verify reading    on    set    voltmeter.        If voltage   is   low   and   the   voltage adjust    rheostat    on    the    control panel will not correct the deficiency.  test the voltage adjust rheostat (para.  4-37).  If rheostat tests   defective,   replace   rheostat and  retest  generator  starting  with step   1.      If   rheostat   tests   good, proceed with step 4. (4) Check     exciter voltage across terminals 20 and 21 of the voltage regulator   terminal   board.      This voltage  may  vary  but  should  be about  30-35  vdc.    If  voltage  fails to     meet     above     specifications, check    for    AC    voltage    across terminals 24 and 27 of the voltage regulator   terminal   board.      The voltage  here  should  be  the  same as    readings    obtained    at    load terminals.  If no voltage is present at terminals 24 and 27, proceed to step  5.    If  voltage  is  present  at terminals   24   and   27   but   not   at terminals    20    and    21,    replace voltage regulator and retest generator   output.      If   voltage   is present  at  24  and  27  and  at  20 and   21,   but   is   not   adjustable, replace     voltage     regulator     and retest generator output. (5) Lower     front     panel     of     control cabinet   and   momentarily    press the  field  flash  switch  (figure  3-5). If voltage comes up on generator and is adjustable to proper levels, proceed  to  step  6.    If  voltage  is not  present,  use  a  multimeter  at pins  11  and  13  of  connector  P4 and check for battery voltage with manual   field   flash   engaged.      If battery  voltage  is  not  present  at pins  11  and  13,  check  for  open circuit between battery and Change 8  4-76