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TM 9-2320-364-20-2
2-1388
26. REAR BLACKOUT CLEARANCE OR TAILLIGHT DOES NOT OPERATE (CONT).
Regular stoplights operate
indicating wire 1435 to rear
composite light OK.
Blackout clearance lights
operate indicating 10 to 14 vdc
to wire 1680.
Wire 1680/24 faulty.
Rear composite light 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
lamp will not operate.
YES
NO
Repair wire 1680/24
(see schematic Fig
2-35) or notify DS
Maintenance.
Verify repair, go to
Step 9 of this Fault.
8.
Are 10 to 14 vdc measured on
wire 1680/24 to faulty black-
out taillight rear composite
light?
Replace rear
composite light
(Para 7-47).
Verify repair, go to
Step 9 of this Fault.
WARNING
10 to 14 vdc present to blackout
clearance and taillight socket
center contact.
Ground present on blackout
clearance and taillight socket
outer contact.
Blackout clearance and taillight
lamp OK.
Rear clearance light and
composite light OK.
KNOWN INFO
POSSIBLE PROBLEMS
TEST OPTIONS
REASON FOR QUESTION
Verify repair.
If blackout clearance and
taillights operates, fault has
been corrected.
YES
NO
Fault not corrected.
Notify DS
Maintenance.
9.
Do all rear blackout clearance
and taillights operate?
Fault corrected.
Read WARNING
on Page 2-1389
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