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.
A Open air inlet doors (TM 9-2350-25610). Disconnect
batteries to master relay, voltage regulator, and slave
receptacle wiring harness from regulator. Place red
lead of multimeter on socket A of wire 62/2 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 not present,
troubleshoot battery circuit. If voltage is present, go to
step B.
B Place red lead of multimeter in pin A of wire 62/2 and
black lead to ground. Turn MASTER and APU GEN
switches ON, start APU, and check for voltage. Turn
APU and MASTER and APU GEN switches OFF. If
voltage is present, go to step C. If voltage is not
present, replace voltage regulator (see paragraph 6-5).
C Reconnect batteries to master relay, voltage regulator,
and slave receptacle wiring harness to regulator.
Disconnect bulkhead to APU, master relay, and rigger's
lights wiring harness from regulator. Place red lead of
multimeter in socket D of wire 61/1 and black lead to
ground. Turn MASTER and APU GEN switches ON,
start APU, and check for voltage. Turn APU and
MASTER and APU GEN switches OFF. If voltage is
present, go to step D. If voltage is not present, replace
voltage regulator (see paragraph 6-5).
2-148