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TM 9-2320-364-20-2
2-1386
26. REAR BLACKOUT CLEARANCE OR TAILLIGHT DOES NOT OPERATE (CONT).
Regular stop lights operate
indicating wire 1435 to rear
composite light OK.
10 to 14 vdc present to blackout
taillight socket center contact.
Rear composite light faulty.
Blackout taillight lamp faulty.
Wire 1680 faulty.
KNOWN INFO
POSSIBLE PROBLEMS
TEST OPTIONS
REASON FOR QUESTION
Continuity test.
STE/ICE-R #91.
If continuity is not measured,
blackout taillight lamp will not
operate.
YES
NO
Replace rear
composite light
(Para 7-47).
Verify repair, go to
Step 9 of this Fault.
7.
Is continuity measured
between socket ground
contact of blackout taillight
socket and a known good
ground?
Replace blackout
taillight lamp
(Para 7-51).
Verify repair, go to
Step 9 of this Fault.
6.
Go to Step 8 of this
Fault.
YES
NO
Regular stop lights operate
indicating wire 1435 to rear
composite lights OK.
Blackout clearance lights
operate indicating 10 to 14 vdc
to wire 1680.
Rear composite light faulty.
Wire 1680/24 faulty.
Blackout taillight lamp faulty.
KNOWN INFO
POSSIBLE PROBLEMS
TEST OPTIONS
REASON FOR QUESTION
Voltage test.
STE/ICE-R #89.
If 10 to 14 vdc are not
measured, blackout taillight will
not operate.
WARNING
WARNING
Are 10 to 14 vdc measured on
socket power contact of
blackout taillight socket?
Read WARNING
on Page 2-1387
Read WARNING
on Page 2-1387
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