SECTION V: TROUBLESHOOTINGTM 9-2350-256-20WARNINGRemove all jewelry such as rings, dog tags, bracelets, etc.If jewelry contacts a metal surface a direct short may resultin instant heating of tools, damage to equipment, and injuryor death to personnel.IReconnect APU control box to foot dimmer switch andbulkhead wiring harness to APU control box. InstallAPU control box (9), four screws (8), four lockwashers(7), and four nuts (6) to mounting bracket. Open airinlet doors. Disconnect bulkhead to APU, master relay,and rigger's lights wiring harness from bulkheaddisconnect. Place red lead of multimeter on pin F ofwire 421 and black lead to ground. Turn MASTER andAPU fuel shut-off switches ON and check for voltage.Turn MASTER and APU fuel shut-off switches OFF. Ifvoltage is present, go to step J. If voltage is notpresent, repair/replace wire 421 of APU control box tofoot dimmer switch and bulkhead wiring harness (seeparagraph 6-79 for dual voltage; 6-80 for singlevoltage).JReconnect bulkhead to APU, master relay, and rigger'slights wiring harness to bulkhead disconnect. Opencenter-front air inlet doors (TM 9-2350-256-10).Disconnect bulkhead to APU, master relay, and rigger'slights wiring harness from APU engine disconnect.Place red lead of multimeter on pin B of wire 421 andblack lead to ground. Turn MASTER and APU fuelshut-off switches ON and check for voltage. TurnMASTER and APU fuel shut-off switches OFF. Ifvoltage is present, notify Direct Support Maintenance.If voltage is not present, repair/replace wire 421 ofbulkhead to APU, master relay, and rigger's lightswiring harness (see paragraph 6-75 for dual voltage; 6-76 for single voltage).2-173
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