TM    5-6115-585-12 NAVFAC   P-8-623-12 TO-35C2-3-455-1 TM-05684C/05685B-12 Table  4-4.  Voltmeter-Ammeter  Range  Selector  Switch  Continuity  Check Switch Position Volts Phase Amps L1-L2 3 L1 L2-L3 3 L2 L3-L1 3 L3 L3-LO 3 L3 L3-L1 1 L3 L3-LO 1 L3 Check for Continuity Between Terminals 11-15 21-23 31-33 41-46-47 51-52 11-17 21-24 31-33 41-42-47 51-53 11-17-18* 21-25 31-33 41-42-43 51-54 11-18 21-26 31-33 41-42-43 51-55 11-12 21-27 31-37 41-42-43-45 51-56 11-12 21-28 31-37 41-43-45-46 51-57 * Terminal 17 is jumped to terminal 18. (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  continuity is not found for each set of terminals listed, replace switch. (11) Relays (K1), (K2), (K3), relay assembly (A1), diodes (CR1) and (CR2) (see figures 1-7 and 4-33). Open circuit breaker (CB2). On ASK equipped generators, remove batteries access door. Disconnect battery cable. Tag, disconnect and tape the following terminal lugs: A1 and A2 on crank relay (K3), 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 A1. Tact diodes CR1 and CR2 for shorted or open condition with ohmmeter. Check CR1 by connecting positive lead of ohmmeter to A1-5 and negative lead to A1-6. Ohmmeter should indicate high resistance. Reverse ohmmeter leads. Ohmmeter should read low resistance. If either CR1 or CR2 fails the above test, the diode is defective and must be replaced. Reconnect terminals to A1-5, A1-6, A1-7, and A1-8 on relay assembly A1. 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 continuity between A1-3 and A1-4 on relay assembly A1. Continuity should end when master switch is released, Repeat the above continuity test  for  preheat  relay  K2  while  holding  master  switch  in PREHEAT position. If either K2 or K3 fail the continuity test, the relay is defective and must be replaced. Reconnect terminals A1 and A2 to relay K2 and K3, and terminals A1-4 and A1-3 to relay assembly A1. (12) Terminal Board Assembly (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 indicated 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  ohm- meter   check   primary   winding   by   measuring   resistance from   terminal   H1   to   H2.   Resistance   should   be   18.6 ohms ± 1.86 ohms. Check secondary winding by 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 resistance. replace transformer. (15)   Transformer   (T2)   (see   figure   4-33).   Tag   and disconnect  four  leads  to  transformer  T2.  Check  primary winding  by  measuring  resistance  from  terminal  H1  to  H2. Resistance  should  be  155  ohms  ±  15.5  ohms.  Check  sec- ondary  winding  by  measuring  resistance  from  terminal  Xl to  X2.  Resistance  should  be  18.8  ohms  ±  1.88  ohms.  If either  of  the  windings  do  not  show  the  proper  resistance, replace  transformer. 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   Tranducer   (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 8 4-42.1