TM 5-5420-226-20-1
DETAILED
TROUBLESHOOTING
PROCEDURE
Symptom-27
VEHICLE
OPERATION-HULL
POWER
NO POWER
DISTRIBUTION
FROM MASTER
RELAY
(MASTER
BAITERY
INDICATOR
LAMP WILL
LIGHT).
i
~
~~~fq,~~
Use extreme care when working with
circuit 81. This circuit carries battery
voltage at all times, whether MASTER
BA~ERY
switch is ON or OFF.
I
~NOTE—
This procedure is to be performed by
two
persons.
The
lead person
is
referred to as the first technician and
shall direct the activity of the second
person called the second technician.
FOR CLARITY
QUADRANT
ASSEMBLIES
NOT SHOWN
)Listen
for clicking sound from MASTER RELAY when
MASTER BAITERY
switch is set ON.
Second Technician
(Operator’s
Station)
l Set MASTER BATTERY switch ON.
l If master relay is working, a click should he heard from
master relay.
l Set MASTER BATTERY switch OFF and ON several
times, listening for clicking sound.
/
(UNDER
FLOOR
ACCESS
COVER)
Can clicking sound be heard?
I
\
e
/
>
/
MASTER
RELAY
FOR CLARITY
ACCESS
COVER
REMOVED
l Check for electrical power to
I
coil of master relay (CKT
I
459A).
I
TA107O61
4-372
