CHAPTER 2: VEHICLE MAINTENANCE INSTRUCTIONSTM 9-2350-256-202-19 ELECTRICAL TROUBLESHOOTING-ContinuedFIRE EXTINGUISHER ENGINE SHUTOFF LIGHT--ContinuedWARNINGRemove all jewelry such as rings, dog tags,bracelets, etc. If jewelry contacts a metalsurface a direct short may result in instantheating of tools, damage to equipment, andinjury or death to personnel.DReconnect wire 54B of flasher system panel wiringharness to diode lead assembly connector. Disconnectwire 54B/GND of diode assembly from connector.Place red lead of multimeter on pin of connector andblack lead to ground. Turn MASTER and FUELSHUTOFF switches OFF. If voltage is present,repair/replace wire 54B/GND of diode lead assemblyfrom connector to GND (see paragraph 6-89). Ifvoltage is not present, repair/replace connector ofdiode lead assembly (see paragraph 6-89).EReconnect wire 54B of flasher system panel wiringharness to connector at fire extinguisher interlockswitch. Disconnect flasher system panel wiringharness Y-connector from wire 54A of fire extinguisherinterlock switch assembly. Place red lead ofmultimeter in wire 54A and black lead to ground. TurnMASTER and FUEL SHUTOFF switches ON, releasefire extinguisher interlock switch and check for voltage.Turn MASTER, FUEL SHUTOFF, and fire extinguisherinterlock switches OFF. If voltage is present, replaceconnector of flasher system panel wiring harness (seeparagraph 6-48). If voltage is not present, troubleshootfuel shutoff solenoid circuit.2-88
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