CORRECTIVE ACTION Continued
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 WP 0202 00). If
voltage is not present, troubleshoot master relay circuit (see WP 0042 00).
Remove four nuts (6), four lockwashers (7), and four screws (8), and release APU control box (9) from
mounting bracket. Place a jumper wire from pin N to socket N. Place red lead of multimeter on pin J of
wire 493 and black lead to ground. Turn MASTER APU FUEL SHUTOFF switches ON, and check
for voltage. Turn MASTER and APU FUEL SHUTOFF switches OFF. If voltage is present, go to step
12 If voltage is not present, go to step 6.