TM
9-2320-363-20-1
Table 3-1.
Troubleshooting
(Cont)
Malfunction
Test or Inspection
Corrective Action
4.
NONE
OF THE
Step
1.
Step 2.
Step 3.
Step 4.
Step 5.
5.
ONE
OR MORE
Step 1.
Step 2.
Step 3.
ELECTRICAL SYSTEM (CONT)
Blackout Light Circuits (Cont)
BLACKOUT
(6/0)
MARKER
LIGHTS
OPERATE.
Inspect light bulbs.
.
Replace
if broken or defective
(pages 4-211,
4-214,
4-216).
Disconnect
B/O marker
lights relay from connector.
Check for +24
VDC
at
connector 30.
.
If +24
VDC
is present, go to step 3. If no voltage
is present,
repair
lead 421 V (page 3-2).
Check for +24 VDC
at connector 85.
.
If +24
VDC
is present, go to step 4. If no voltage
is present,
repair
lead 420E
(page 3-2).
Check for continuity
between
connector 86 and ground.
.
If continuity
is indicated, go to step 5. If no continuity is
indicated,
repair ground lead (page
3-2).
Install jumper wires
between
connector 30 and stoplights relay, connector
85
and stoplights relay,
and connector 86 and stoplights relay. Check for
+24 VDC
at stoplights relay contact 87.
.
If +24
VDC
is present, repair lead 421A
(page 3-2).
If no
voltage
is present,
replace
6/0
marker
lights relay (pages
4-197,
4-198).
BLACKOUT
(B/O)
MARKER
LIGHTS
NOT OPERATING.
Inspect light bulb(s).
.
Replace
if broken or defective
(pages
4-211,
4-214,
4-216).
Remove
lamp(s)
from
defective
circuit(s)
(pages
4-211,
4-214,
4-216).
Check
for
continuity
between
socket
and
ground.
l
If continuity
is
indicated,
go
to
step
3.
If no
continuity
is
indicated,
replace
lamp(s)
(pages 4-211,
4-214,
4-216).
Disconnect
ground (B/O)
marker light(s). Check for continuity between
ground
lead(s)
and ground.
.
If continuity
is indicated, repair lead(s)
421A
(page
3-2).
If no
continuity
is indicated,
repair ground lead(s)
(page
3-2).
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