CHAPTER 2: VEHICLE MAINTENANCE INSTRUCTIONS
TM 9-2350-256-20
2-19 ELECTRICAL TROUBLESHOOTING-Continued
FUEL/WATER SEPARATOR CONTROL MODULE SYSTEM-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.
D Reconnect fuel/water separator control module to
solenoid drain valve wiring harness to control
module and disconnect from solenoid drain valve.
Place red lead of multimeter in socket A of wiring
harness and black lead to ground. Turn MASTER
switch on and check for voltage. Turn MASTER
switch OFF. If voltage is present, replace solenoid
drain valve (see paragraph 4-17). If voltage is not
present, repair/replace fuel/water separator
control module to solenoid drain valve wiring
harness (see paragraph 6-96).
E Reconnect engine wiring harness connector to auto
water drain module. Open air inlet doors (TM 9-
2350-256-10). Disconnect wire K of bulkhead to
APU master relay and rigger's lights wiring
harness from bulkhead side of 15 A circuit breaker
in battery compartment. Place red lead of
multimeter in female connector of wire K and black
lead to ground. Turn MASTER switch on and check
for voltage. Turn MASTER switch OFF. If voltage
is present, go to step F. If voltage is not present,
troubleshoot battery circuit.
F Reconnect wire K of bulkhead to APU master relay
and rigger's lights wiring harness to bulkhead
connector side of 15 A circuit breaker. Disconnect
wire K of bulkhead to engine bracket and rear fuel
tank transmitter wiring harness from other side of
15 A circuit breaker. Place red lead of multimeter
on circuit breaker terminal and black lead to
ground. Turn MASTER switch on and check for
voltage. Turn MASTER switch OFF. If voltage is
present, go to step G. If voltage is not present,
replace 15 A circuit breaker.
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