APU LOW OIL PRESSURE SYSTEM (cont) - TM-9-2350-256-20

APU LOW OIL PRESSURE SYSTEM (cont) - TM-9-2350-256-20_243

APU LOW OIL PRESSURE SYSTEM (cont) - TM-9-2350-256-20_245

TM-9-2350-256-20 Carrier Cargo Tracked 6-Ton M548A1 (2350-01-096-9356) M548A3 2350-01-369-6081 Manual
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CHAPTER 2: VEHICLE MAINTENANCE INSTRUCTIONS TM 9-2350-256-20 2-19 ELECTRICAL TROUBLESHOOTING-Continued APU LOW OIL PRESSURE SYSTEM-Continued WARNING Remove all jewelry such as rings, dog tags, bracelets, etc. If jewelry contacts a metal surface a direct short may result in instant heating of tools, damage to equipment, and injury or death to personnel. C Reconnect APU control box to dimmer switch and bulkhead wiring harness to APU control box. Remove three screws (1), three lockwashers (2), ground wire (3), and flat washer (4), and release main switch panel (5) from mounting bracket. Disconnect wire 10-419 from Y-connector of switch panel, radio, and bilge pump to bulkhead wiring harness at main switch panel. Turn MASTER switch on, and check for voltage. If voltage is present, repair wire 419 from Y-connector at main switch panel to APU control box bulkhead wiring harness. If voltage is not present, go to step D. D Reconnect wire 10-419 to Y-connector of switch panel, radio, and bilge pump to bulkhead wiring harness to main switch panel. Install main switch panel (5), flat washer (4), ground wire (3), three lockwashers (2), and three screws (1) to mounting bracket. Open air inlet doors (TM 9-2350-256-10). Disconnect wire 48 pin A from bulkhead to master relay wiring harness. Place red multimeter lead in socket and black lead to ground. Turn MASTER switch on and check for voltage. If voltage is present, repair/replace switch panel, radio, and bilge pump to bulkhead wiring harness (see paragraph 6-53). If voltage is not present, troubleshoot master relay circuit (see paragraph 2-19, master relay fails to operate). 2-176

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