TM  5-6115-584-12 NAVFAC  P-8-622-12 TO-35C2-3-456-1 TM-05682C-12 Table  4-4.  Voltmeter-Ammeter  Range  Selector  Switch  Continuity  Check Switch Position volts Phase Amps Check  for  Continuity  Between  Terminals L1-L2 3 L1 11-15 21-23 31-33 41-46-47 51-52 L2-L3 3 L2 11-17 21-24 31-33 41-42-47 51-53 L3-L1 3 L3 11-17-18* 21-25 31-33 41-42-43 51-54 L3-L0 3 L3 11-18 21-26 31-33 41-42-43 51-55 L3-L1 1 L3 11-12 21-27 31-37 41-42-43-45 51-56 L3-L0 1 L3 11-12 21-28 31-37 41-43-45-46 51-57 *  Terminal  17  is  jumped  to  terminal  18. continuity.  With  the  switch  in  the  ON  position,  there should  be  continuity.  Replace  switch  if  necessary. (10)  Ammeter  .   Voltmeter   Transfer   Switch   (S8). Tag  and  disconnect  sixteen  leads  to  range  selector switch. Check for continuity between terminals for each of the six switch positions as given in table 4-4. If con- tinuity  is  not  found  for  each   set  of  terminals   listed, replace switch. (11)  Relays  (K1),  (K2),  (K3),  Assembly  A-1,  CR-1,  and CR-2. Open circuit breaker (CB2). On ASK equipped generators, remove batteries access door. Disconnect battery cable. Tag, dis- connect  and  tape  terminals  lugs  of  the  following:  A1  and  A2  on crank relay (K3), A1 and A2 on preheat relay (K2), and A1-4 and A1-3  on  relay  assembly  A1,  Tag  and  disconnect  terminals  A1-5, A1-6,  A1-7,  and  A1-8  on  relay  assembly  A1Test  for  shorted  or open diodes CR-1 and CR-2 by using an ohmmeter. Connect posi- tive  lead  of  the  ohmmeter  to  A1-5  and  negative  lead  to  A1-6, ohmmeter should indicate high resistance, then reverse the leads and  ohmmeter  should  indicate  low  resistance.  Connect  positive lead  of  the  ohmmeter  to  A1-7  and  negative  lead  to  A1-8,  ohm- meter should read high resistance, then reverse leads and ohm- meter  should  read  low  resistance.  Replace  defective  diodes  that fail  the  above  test.  Reconnect  wire  to  A1-5,  A1-6,  A1-7,  and A1-8 to A1 relay assembly. Reconnect battery cable, close circuit breaker (CB2). Hold master switch in START position and using an ohmmeter  check  for  continuity  between  terminals  A1  and  A2  on crank  relay  K3  and  A1-3  and  A1-4  on  A1  relay  assembly.  Con- tinuity should end when master switch is released. Repeat test for preheat relay K2 holding master switch in PREHEAT position. Re- place defective relays. Reconnect wires to relay K2, K3, and A1 relay assembly. (12) Terminal Board Assemblies (TB4) and (TB5). Tag and disconnect  leads  to  terminal  boards.  Test  from  each  terminal  to ground for shorts. Replace board if any terminal shows continuity to ground. NOTE On ASK equipped generators, access to J1 and J2 is through air intake door. (13)   Wiring   Harness.   Test   wiring   harness   by using  an  ohmmeter  checking  continuity  of  each  wire. Perform   point   to   point   checks   between   points   indi- cated   on   figure   1-10.   Wiring   harness   need   not   be totally  disconnected  for  checking  continuity. (14)  Transformer  (T1)  (see  figure  4-33).  Tag and   disconnect   five   leads   to   transformer   T1.   Using an   ohmmeter   check   primary   winding   by   measuring resistance   from   terminal   H1   to   H2.   Resistance should  be  18.6  ohms  ±  1.86  ohms.  Check  secondary winding  bv  measuring  resistance  from  terminal  X1  to X3.  Resistance  should  be  1.6  ohms  ±  .16  ohms.  If either   of   the   windings   do   not   show   the   proper   re- sistance,   replace   transformer. (15)  Transformer  (T2)  (see  figure  4-33).  Tag and  disconnect  four  leads  to  transformer  T2.  Check primary   winding   by   measuring   resistance   from   ter- minal  H1  to  H2.  Resistance  should  be  155  ohms ±  15.5  ohms.  Check  secondary  winding  by  measuring resistance  from  terminal  X1  to  X2.  Resistance  should be  18.8  ohms  ±  1.88  ohms.  If  either  of  the  windings do   not   show   the   proper   resistance,   replace   trans- former. b.  Remove. (1) Control Cubicle.  On ASK equipped generators, remove rear panel assembly (para. 5-7). Open air intake door. Tag and detach two connectors for wiring harness from control cubicle (see figure 1-2). Remove screw (6, figure 4-34) and nut (8) attaching ground strap to cubicle support frame. Remove four screws (2), Iockwashers (3) and flatwashers (4) attaching control cubicle to vibration mounts (5) and remove cubicle (1). c.   Inspect. (1)   Inspect   the   control   cubicle   assembly   per paragraph  3-19. (2)  Frequency  Transducer  (A3)  (see  figure  4-33). Inspect   transducer   for  physical  damage.  Check  to  see that  the  electrical  connections  to  transducer  are  clean and   tight.   Check   to   see   that   transducer   is   securely attached  to  the  control  cubicle. Change 7 4-42.1