CHAPTER 2: VEHICLE MAINTENANCE INSTRUCTIONSTM 9-2350-256-202-19 ELECTRICAL TROUBLESHOOTING-ContinuedAPU GENERATOR SYSTEM (DUAL VOLTAGE)--ContinuedWARNINGRemove all jewelry such as rings, dogtags, bracelets, etc. If jewelry contactsa metal surface a direct short may resultin instant heating of tools, damage toequipment, and injury or death topersonnel.D Place red lead of multimeter on pin C of wire 478A andblack lead to ground. Turn MASTER and APU GENswitches ON, start APU, and check for voltage. TurnMASTER and APU GEN switches OFF. If voltage is notpresent, replace APU regulator (see paragraph 6-5). Ifvoltage is present, go to step E.E Reconnect bulkhead to APU, master relay, and rigger'slights wiring harness to APU regulator. Open center-front air inlet doors (TM 9-2350-256-10). Disconnectbulkhead to APU, master relay, and rigger's lights wiringharness from APU engine disconnect. Place red lead ofmultimeter on pin H of wire 478A. Turn MASTER andAPU GEN switches ON and check for voltage. TurnMASTER and APU GEN switches OFF. If voltage is notpresent, repair/replace wire 478A of bulkhead to APU,master relay, and rigger's lights wiring harness (seeparagraph 6-75). If voltage is present, go to step F.F Reconnect bulkhead to APU, master relay, and rigger'slights wiring harness to APU regulator. Disconnectbulkhead to APU, master relay, and rigger's lights wiringharness from APU engine disconnect. Place red lead ofmultimeter in socket G of wire 62 and black lead toground. Turn MASTER and APU GEN switches ON andcheck for voltage. Turn MASTER and APU GENswitches OFF. If voltage is present, go to step G. Ifvoltage is not present, repair/replace wire 62 ofbulkhead to APU, master relay, and rigger's lights wiringharness (see paragraph 6-75).2-140
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