TM 5-5420-226-20-1
DETAILED TROUBLESHOOTING
PROCEDURE
Symptom-54
SUPPORT SYSTEM - FIRE EXTINGUISHER
(Continued)
K=--
Check contact
C (CKT 975) of front accessory
harness
connector
at fwe extmguwher
relay for electrical
FFirst
Technician
(Ccmnrnarrders
Station)
I
~
WARNING
Use extreme
care when working
with
circuit
975.
This
circuit
carries
battery
voltage
at all times
whether
MASTER
BAITERY
switch
is ON or
OFF.
1
l Connect red probe of meter to contact C (CKT 975) it
front
accessory
harness
connector
for fire extinguisher
relay and black
probe
to ground.
l Check if meter indicates
18 to 30 volts dc when FIRE-
PULL
HARD
interior
control
handle
is pulled.
Second
Technician
(Operators
Station)
l Slowly pull FIRE-PULL
HARD
interior
control
handle
to close microswitch
located
in handle
release
mechanism.
Does meter
indicate
18 to 30 volts dc?
I
-
,
TO VEHICLE
GROUND
in
/-J
FIRE EXTINGUISHER
RELAY
(
Replace
fire extinguisher
relay
(page 10-158).
I
TA10726O
4-571