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Page Title: Figure 4-67. Heater Relay (K2)
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4-56. TM5-4120-377-14 Preliminary   procedure:   Remove   junction   box cover. (See para 4-47.) Figure  4-67.  Heater  Relay  (K2) a. Removal (1) Tag  and  disconnect  wire  leads. (2)  Using  wrench,  remove  four  lock  nuts  from  relay. (3) Remove relay. b.  Inspection (1)  Check  for  loose,  corroded,  missing,  or  broken  terminal  connections. (2)   Check   relay   for   cracks,   evidence   of   overheating,   and   other   visible   damage.   Replace   if   damaged. c.   Test (1) Use a  continuity  tester  or  a  multimeter  set  on  the  lowest  OHMS  scale  to  check   continuity   between terminals  A1  and  A2,  B1  and  B2,  and  C1  and  C2.  All  three  contacts  should  be  open.  If  there  is  continuity, replace  the  relay. (2) Check continuity between coil terminals X1 and X2. If there is no continuity, the coil is open. Replace the relay. (3)  Apply  external  24  volts  dc  power  source  across  terminals  X1  and  X2  and  repeat  continuity  checks between  terminals  A1  and  A2,  B1  and  B2,  and  C1  and  C2.  All  three  contacts  should  be  closed.  If  there  is  no continuity,  replace  the  relay. (4)  Remove  the  external  24  volts  dc  power  source  from  the  coil  terminals  X1  and  X2. 4-108

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