TM
5-5420-226-20-1
Symptom-63
DETAILED
TROUBLESHOOTING
PROCEDURE
SUPPORT
SYSTEM
- VEHICLE
LIGHTING
BO DRIVE
LAMP
WILL
NOT
LIGHT
(IR SERVICE
LAMPS
WILL
LIGHT).
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.
MASTER
CONTROL
PANEL
PCheck left headlight
base harness (CKT 19) connector
for electrical
Dower.
I
Second
Technician
(Operator’s
Station)
l
l
l
First
l
l
l
Set MASTER
BATTERY
switch
OFF.
Set BO SELECTOR
switch
to BLACKOUT
DRIVE.
Turn
LIGHTING
CONTROL
switch
lever to BO
DRIVE.
Technician
(Left
Front
of Vehicle)
Disconnect
left headlight
assembly
from
dual
base
harness
connector.
Set multimeter
to measure
18 to 30 volts dc, or use STE/
ICE Test
No. 89 (page
4-81).
Connect
red probe of meter
to contact
G (CKT
19) of
dual base harness
connector
and black probe to ground.
Second
Technician
(Operator’s
Station)
l Set MASTER
BA’ITERY
switch
ON.
First
Technician
(Left
Front
of Vehicle)
l Check if meter indicates
18 to 30 volts dc.
Does meter
Indicate
18 to 30 volts dc?
I
I .0--
‘AY-
!-.iiidfi?
,,;’-,:j 0
LIGHTING
CONTROL
SWITCH
LEVER
Iv
DUAL ‘BASE
HARNESS
v
CONNECTOR
l%
I
w
Replace
left headlight
assembly
(page 10-172).
m
i
TA107315
4-626
