TM  10-3930-638-24&P 2-25.   INSTRUMENT   PANEL   TROUBLESHOOTING MALFUNCTION TEST OR INSPECTION CORRECTIVE  ACTION NOTE Refer to paragraph 2-13 for OIL PRESSURE gage and FUEL LEVEL gage troubleshooting, and paragraph 2-22 for ALTERNATOR warning light troubleshooting. Other switches and lights are covered in the paragraphs that cover the systems of which they are a part. 1. WARNING LIGHTS INOPERATIVE Step 1. Turn a. b. and  hold  IGNITION  switch  key  at  LAMP  TEST  position. If at least one warning indicator (ENGINE TEMPERATURE, TRANSMISSION TEMPERA- TURE, or HYDRAULIC FILTER) is on, check for open circuit in wiring, connector, or isolation diode  between  inoperative  warning  light  and  IGNITION  switch.  If  circuit  check  is  satisfactory, replace warning light (para 2-28e). If at least one warning indicator is not on. turn IGNITION switch kev to ON position and check if a slight buzz can be heard at electric fuel pump. If slight buzz indicating electric fuel pump operation is not heard, troubleshoot IGNITION switch (para 2-25, MALFUNCTION 2). If slight buzz is heard, check for open circuit in wiring between TRANSMISSION TEMPERATURE warning light and 6 ampere circuit breaker. If circuit check is satisfactory, proceed to step 2. Step 2. Disconnect wires from engine temperature, transmission temperature, oil pressure and hydraulic filter  switches. Temporarily connect a jumper from each wire to vehicle ground and turn IGNITION switch key to ON position. ENGINE  TEMPERATURE,  TRANSMISSION  TEMPERATURE,  OIL  PRESSURE  and HYDRAULIC  FILTER  warning  lights  should  be  on. 2-112

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