CHAPTER 2: VEHICLE MAINTENANCE INSTRUCTIONSTM 9-2350-256-202-19 ELECTRICAL TROUBLESHOOTING-ContinuedAPU STARTING 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.HReconnect wire 65A to APU START switch side ofcircuit breaker. Disconnect wire 65 from panelconnector side of 15 A circuit breaker. Place red leadof multimeter in wire 65 and black lead to ground.Turn MASTER and PREHEAT switches ON, and checkfor voltage. Turn MASTER and PREHEAT switchesOFF. If voltage is not present, go to step I. If voltageis present, replace 15 A circuit breaker (see paragraph13-7).IDisconnect APU control box to foot dimmer switch andbulkhead wiring harness from APU control box. Placered lead of multimeter in socket B of wire 65 and blacklead to ground. Turn MASTER and PREHEATswitches on, and check for voltage. Turn MASTERand PREHEAT switches OFF. If voltage is present,repair/replace wire 65 of APU control box. If voltage isnot present, go to step J.JReconnect APU control box to foot dimmer switch andbulkhead wiring harness to APU control box.Disconnect wire 487 from 15 A circuit breaker. Placered lead of multimeter on terminal of 15 A circuitbreaker and black lead to ground. Turn MASTER andPREHEAT switches ON, and check for voltage. TurnMASTER and PREHEAT switches OFF. If voltage ispresent, repair/replace wire 487 of APU control boxwiring harness (see paragraph 13-7). If voltage is notpresent, go to step K.2-166
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