SECTION V: TROUBLESHOOTINGTM 9-2350-256-20WARNINGRemove all jewelry such as rings, dogtags, bracelets, etc. If jewelry contacts ametal surface a direct short may result ininstant heatingof tools, damage toequipment, and injury or death topersonnel.HReconnect wire 419 to APU FUEL SHUTOFF switchside of 15 A circuit breaker. Disconnect wire 419 fromcircuit breaker side of APU FUEL SHUTOFF switch.Place red lead of multimeter in wire 419 and black leadto ground. Turn MASTER switch on and check forvoltage. Turn MASTER switch OFF. If voltage ispresent, go to step I. If voltage is not present,repair/replace wire 419 of APU fuel shutoff leadassembly (see paragraph 13-7).IReconnect wire 419 to circuit breaker side of APUFUEL SHUTOFF switch. Disconnect wire 421 fromAPU FUEL SHUTOFF switch. Place red lead ofmultimeter on terminal of APU FUEL SHUTOFF switchand black lead to ground. Turn MASTER and APUFUEL SHUTOFF switches ON and check for voltage.Turn MASTER and APU FUEL SHUTOFF switchesOFF. If voltage is present, go to step J. If voltage isnot present, replace APU FUEL SHUTOFF switch (seeparagraph 13-7).JReconnect wire 421 to APU FUEL SHUTOFF switch.Disconnect connector from LOW OIL PRESS lamp.Place red lead of multimeter in wire 27 and black leadto ground. Turn MASTER and APU FUEL SHUTOFFswitches ON and check for voltage. Turn MASTERand APU FUEL SHUTOFF switches OFF. If voltage ispresent, go to step K. If voltage is not present,repair/replace wire 421/27 of APU control box wiringharness (see paragraph 13-7).2-179
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