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.
H
Reconnect wire 10 to 15 A circuit breaker.
Disconnect wire 76 from circuit breaker side of FUEL
PUMP switch. Place red lead of multimeter in wire 76
and black lead to ground. Turn MASTER switch on,
and check for voltage. Turn MASTER switch OFF. If
voltage is present, go to switch I. If voltage is not
present, repair/replace wire 76 of fuel pump switch
panel lead assembly (see paragraph 6-50).
I
Reconnect wire 76 to circuit breaker side of FUEL
PUMP switch. Disconnect wire 76 from panel side of
FUEL PUMP switch. Place red lead of multimeter on
terminal of FUEL PUMP switch and black lead to
ground. Turn MASTER and FUEL PUMP switches
ON and check for voltage. Turn MASTER and FUEL
PUMP switches OFF. If voltage is present,
repair/replace wire 76 of starter switch wiring harness
(see paragraph 6-57). If voltage is not present,
replace FUEL PUMP switch (see paragraph 6-10).
J
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 K.
2-93
