TM 9-2350-256-20-1
0056 00
CORRECTIVE ACTION Continued
9.
Reconnect APU control box to foot dimmer switch and bulkhead wiring harness to APU control box.
Remove four screws (5) and four lockwashers (6), and release rear panel (7) from APU control box
(4). Disconnect wire 61 of APU control box wiring harness from APU GEN switch. Place red lead of
multimeter in wire 61 and black lead to ground. Turn MASTER and APU GEN switch ON and check
for voltage. If voltage is present, go to step 10. If voltage is not present, repair/replace APU control
box wiring harness (see WP 0438 00).
10. Reconnect wire 61 to APU GEN switch. Disconnect wire 61A 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 61A of APU control box wiring harness (see WP 0438 00). If voltage is not
present, replace APU GEN switch (see WP 0438 00).
0056 00-7
