CHAPTER 2: VEHICLE MAINTENANCE INSTRUCTIONSTM 9-2350-256-202-19 ELECTRICAL TROUBLESHOOTING--ContinuedAPU LOW OIL PRESSURE SYSTEM-ContinuedWARNINGRemove 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.FReconnect APU control box to foot dimmer switch andbulkhead wiring harness to APU control box. Removefour screws (10), four lockwashers (11), and releaserear panel (12) from APU control box. Disconnect wire419 from panel connector side of 15 A circuit breaker.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 G. If voltage is not present,repair/replace wire 419 of APU control box wiringharness (see paragraph 13-7).GReconnect wire 419 to panel connector side of 15 Acircuit breaker. Disconnect wire 419 from APU FUELSHUTOFF switch side of 15 A circuit breaker. Placered lead of multimeter on terminal of circuit breakerand black lead to ground. Turn MASTER switch onand check for voltage. Turn MASTER switch OFF. Ifvoltage is present, go to step H. If voltage is notpresent, replace 15 A circuit breaker (see paragraph13-7).2-178
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