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, 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 Reconnect 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 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 C.
2-191
