CHAPTER 2: VEHICLE MAINTENANCE INSTRUCTIONS
TM 9-2350-256-20
2-19 ELECTRICAL TROUBLESHOOTING-Continued
APU GENERATOR SYSTEM (SINGLE VOLTAGE)-Continued
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.
U Reconnect wire J to hydraulic pressure switch.
Disconnect wire J of bulkhead to engine wiring
harness and starter relay wiring harness from
bulkhead to APU, master relay, and rigger's lights
wiring harness. Place red lead of multimeter on male
connector of wire J 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 J of bulkhead
to APU, master relay, and rigger's lights wiring
harness (see paragraph 6-76). If voltage is not
present, repair/replace wire J of bulkhead to engine
wiring harness and starter relay wiring harness to
bulkhead disconnect (see paragraph 6-72).
V Reconnect wire J to hydraulic pressure switch.
Disconnect wire H from hydraulic pressure switch.
Place red lead of multimeter on wire H and black lead
to ground. Turn MASTER and APU GEN switches
ON and check for voltage. If voltage is present, go to.
step W. If voltage is not present, replace hydraulic
pressure switch (see paragraph 13-1).
W Reconnect wire H to hydraulic pressure switch.
Disconnect bulkhead to APU, master relay, and
rigger's lights wiring harness from APU engine
disconnect. Place red lead of multimeter in socket F
of wire 61 and black lead to ground. Turn MASTER,
APU pressure, and APU GEN switches ON and check
for voltage. Turn MASTER, APU pressure, and APU
GEN switches OFF. If voltage is present, notify Direct
Support Maintenance. If voltage is not present,
repair/replace wire 61 of bulkhead to APU, master
relay,
and
rigger's
lights
wiring
harness
(see
paragraph 6-76).
2-156