TM-9-2320-387-24 HMMWV Direct Support & General Support Maintenance Manual Volume 1 Download
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TM 9-2320-387-24-I INSTRUMENTS CIRCUIT &‘-> - I fEST opT,o~lAGNOSTIC FLOWCHART I KNOWN INFO ONE OR MORE GAUGES AND WARNING LAMPS DON7 WORK VISUAL REASON FOR QUESTION WITH THE ROTARY SWITCH IN THE ENGINE STOP POSITION, ARE ALL THE GAUGES IN THE OFF POSITION AND WARNING LAMPS OFF? POSSIBLE PROBLEMS If any of the gauges or lamps are functioning, then the electrical system is partially powered in the OFF position. MASTER POWER INSTRUMENTS WIRING SENDING UNITS KNOWN INFO ’ OPTIONS VISUAL TURN THE ROTARY SWITCH OFF. DISCONNECT THE GLOW PLUG CONTROLLER. WITH THE ROTARY SWITCH IN THE RUN POSITION, DO ANY OF THE GAUGES AND WARNING LAMPS FUNCTION? NO POWER TO THE GAUGES WITH THE ROTARY SWITCH IN THE OFF POSlTlON REASON FOR QUESTION If any of the devices work, the master power circuit works. POSSIBLE PROBLEMS MASTER POWER r KNOWN INFO TEST OPTIONS VISUAL ‘OWER AVAIlABLE TO GAUGES AND WARNING LAMPS TURN THE ROTARY SWITCH OFF. RECONNECT THE GLOW PLUG CONTROLLER. TURN THE ROTARY SWITCH ON. DOES THE WAIT-TO- START LAMP COME ON AT ANY TIME? (ENGINE TEMPERATURE MUST BE BELOW 120 “F (49°C)). REASON FOR QUESTION If the wait-to-start light comes on at any time. the circuit is being powered. POSSIBLE PROBLEMS INSTRUMENTS WIRING SENDING UNITS 2-306