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.ADisconnect APU control box to foot dimmer switch andbulkhead wiring harness from APU control box. Placered lead of multimeter in socket N of wire 419 andblack lead to ground. Turn MASTER switch on andcheck for voltage. Turn MASTER switch OFF. Ifvoltage is present, go to step D. If voltage is notpresent, go to step B.BConnect APU control box to foot dimmer switch andbulkhead wiring harness to APU control box. Removethree screws (1), three lockwashers (2), ground wire(3), and flat washer (4), and release main switch panel(5) from mounting bracket. Disconnect wire 10419from Y-connector of switch panel, radio, and bilgepump to bulkhead wiring harness at main switch panel.Turn MASTER switch on, and check for voltage. Ifvoltage is present, repair wire 419 from Y-connector atmain switch panel to APU control box bulkhead wiringharness. If voltage is not present, go to step C.2-169
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