SECTlON 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 wire 26B to Y-connector behind gage
panel. Open air inlet doors. Disconnect bulkhead
to APU, master relay and rigger's lights wiring
harness from bulkhead disconnect. Place red lead
of multimeter in socket H of wire 26 and black lead
to ground. Turn MASTER switch on and check for
voltage. Turn MASTER switch OFF. If voltage is
present, repair/replace wire 26 of APU control box
to foot dimmer switch and bulkhead wiring harness
(see paragraph 6-79 for dual voltage; 6-80 for single
voltage). If voltage is not present, go to step S.
S Reconnect bulkhead to APU, master relay, and
rigger's lights wiring harness to bulkhead. Remove
engine deck (see paragraph 9-51). Disconnect wire
26 of bulkhead to APU, master relay and rigger's
lights wiring harness from connector. Place red
lead of multimeter in wire 26 and black lead to
ground. Turn MASTER switch on and check for
voltage. Turn MASTER switch OFF. If voltage is
present, repair/replace wire 26 of bulkhead to
APU, master relay, and rigger's lights wiring
harness (see paragraph 6-75 for dual voltage; 6-76
for single voltage). If voltage is not present, go to
step T.
T Reconnect wire 26 of bulkhead to APU, master
relay, and rigger's lights wiring harness to
connector. Disconnect bulkhead to engine bracket
and rear fuel tank transmitter wiring harness from
engine disconnect. Place red lead of multimeter on
pin M of wire 26 and black lead to ground. Turn
MASTER switch on and check for voltage. Turn
MASTER switch OFF. If voltage is present
repair/replace wire 26 of bulkhead to engine
bracket and rear fuel tank transmitter wiring
harness (see paragraph 6-73 for dual voltage; 6-74
for single voltage). If voltage is not present, go to
step U.
2-357
