TM 9-2350-256-20-1
0057 00
CORRECTIVE ACTION Continued
13. Reconnect APU control box to foot dimmer switch and bulkhead wiring harness to APU control box.
Remove four screws (5), four lockwashers (6), and rear panel (7) from APU control box (4). Disconnect
wire C of APU control box wiring harness from APU GEN switch. Place red lead of multimeter in
wire C and black lead to ground. Turn MASTER and APU GEN switches on and check for voltage.
If voltage is present, go to step 14. If voltage is not present, repair/replace wire C of APU control box
wiring harness (see WP 0438 00).
14. Reconnect wire C to APU GEN switch. Disconnect wire J from APU GEN switch. Place red lead of
multimeter on APU GEN switch terminal and black lead to ground. Turn MASTER and APU GEN
switches ON, and check for voltage. Turn MASTER and APU GEN switches OFF. If voltage is present,
repair/replace wire J of APU control box wiring harness (see WP 0438 00). If voltage is not present,
replace APU GEN switch (see WP 0438 00). Reconnect wire J to APU GEN switch. Install rear panel
(7), four lockwashers (6), and four screws (5) to APU control box (4). Disconnect APU control box to
foot dimmer switch and bulkhead wiring harness at APU control box.
0057 00-9
