SECTION V: TROUBLESHOOTING
TM 9-2350-256-20
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.
A
Disconnect APU control box to foot dimmer switch and
bulkhead wiring harness from APU control box. Place
red lead of multimeter in socket N of wire 419 and
black lead to ground. Turn MASTER switch on and
check for voltage. Turn MASTER switch OFF. If
voltage is present, go to step D. If voltage is not
present, go to step B.
B
Connect APU control box to foot 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 10419
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 C.
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