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.
R Reconnect bulkhead to engine wiring harness and
starter relay wiring harness to bulkhead. Disconnect
wire C of switch panel to neutral safety to bulkhead
wiring harness from APU control box to foot dimmer
switch and bulkhead wiring harness. Place red lead of
multimeter in female connector of wire C 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 C of APU control box to foot
dimmer switch and bulkhead wiring harness (see
paragraph
6-80).
If
voltage
is
not
present,
repair/replace wire C of switch panel to neutral safety
to bulkhead wiring harness (see paragraph 6-54).
S Reconnect bulkhead to engine wiring harness and
starter relay wiring harness to bulkhead disconnect.
Disconnect wire C of bulkhead to engine wiring harness
and starter relay wiring harness from wire C of
bulkhead to APU, master relay, and rigger's lights
wiring harness. Place red lead of multimeter on male
connector wire C 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 C of bulkhead
to engine wiring harness and starter relay wiring
harness to bulkhead disconnect (see paragraph 6-72).
If voltage is not present, repair/replace wire C of
bulkhead to APU, master relay, and rigger's lights
wiring harness (see paragraph 6-76).
T Reconnect bulkhead to engine wiring harness and
starter relay wiring harness to bulkhead disconnect.
Disconnect wire J from hydraulic pressure switch.
Place red lead of multimeter in wire J and black lead to
ground. Turn MASTER, APU pressure and APU GEN
switches ON and check for voltage. Turn MASTER
and APU GEN switches OFF. If voltage is present, go
to step V. If voltage is not present, go to step U.
2-155
