TM 5-5420-226-20-1
DETAILED TROUBLESHOOTING
PROCEDURE
Symptom-54
SUPPORT SYSTEM - FIRE EXTINGUISHER
T
(Continued)
Y“Checkfront accessoryharness(CKT 975) at fire
extinguisher
relay for electrical
power.
I
[ Second
Technician
(Front
of Crew Compartment)
I
I
When
disconnected,
do
not
allow
battery
ground
straps
to come
into
contact
with any metal surface.
I
~
l Disconnect
three battery
ground
straps
(page
10-268).
First Technician
(Commander’s
Statiop)
Use extreme care when working with
circuit
975.
This
circuit
carries
battery voltage at all times whether
MASTER BATTERY switch is ON or
OFF.
I
n
l Disconnect
front accessory
harness connector
from fire
extinguisher
relay.
l Connect
battery
ground
straps
(page
10-268).
l Connect red probe of meter to contact B (CKT 975) at
front accessory
harness
connector
for tire extinguisher
relay and black probe to ground.
l Check if meter indicates
18 to 30 volts dc.
/
Does meter indicate 18 to 30 volts dc?
!
9
II
TO VEHICLE
GROUND
I
(
l Check fire extinguisher
relay
circuit breaker
for continuity.
I
See Step @
.
TA107259
4-570
