TM   9-2320-273-20 Table  5-6.  Warning  Lamps  and  Alarms  Circuit  Troubleshooting. INSTRUCTION INDICATION YES NO REMARKS 1 ENGINE   TEMPERATURE   WARNING   LAMP   INOPERATIVE. 1 Press START switch. Lamp  lights. Replace Replace  the water  tem- bulb. perature switch  (para 5-73). 2 Attach  test  lead  be- Lamp  lights. Replace Go to Step tween  the  ground  side water  tem- 3. of  the  bulb  (circuit perature 6A)  and  ground  and switch  (para turn  on  the  ENGINE 5-73). RUN  switch. 3 Check  the  ENGINE Lamp  lights. Double Check  wir- lamp  when  the check the ing to cir- ENGINE   RUN temperature cuit  breaker . switch is ON. switch. 4 Check  for  faulty  cir- 12  volts  dc  nominal. Repair  wir- Replace  cir- cuit  breaker  No.  6 ing  (circuits cuit  breaker . with  multi  meter. 44,  44H, 44J). 2 ENGINE   OIL   PRESSURE   LOW   WARNING   LAMP   INOPERATIVE. 1 Attach  test  lead  be- Lamp  lights. Replace  the Replace  the tween  the  ground  side switch  (para bulb. of  the  bulb  (circuit 5-71). 54A)  and  ground  and turn  on  the  ENGINE RUN  switch. 2 Troubleshoot    wiring. LOW   AIR   PRESSURE’   WARNING   LAMP   AND/OR   BUZZER   INOPERATIVE. NOTE The air pressure must be below 60 psi to perform  the  following  check. Attach  a  test  lead a.  Lamp  and  buzzer Replace  the across  both  terminals operate. pressure on  the  LOW  AIR switch  (para PRESSURE  switch 5-81). (located  on  the  fire- b.  Lamp  only  works. Replace the wall inside cab at center). buzzer (para 5-80). 5-38 3