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TM 9-2320-364-20-2
2-1560
45. TRAILER BLACKOUT STOPLIGHTS DO NOT OPERATE.
INITIAL SETUP
1.
Go to Step 2 of this
Fault.
START
NO
Trailer stoplights operate,
indicating wire 1435 at
connector MC15 OK.
22 to 28 vdc not supplied to
connector MC15.
Wire 1676 faulty.
Wire 1678 faulty.
Wire 1435 faulty.
Trailer blackout stoplight relay
R13 faulty.
Wire 1678C faulty.
KNOWN INFO
POSSIBLE PROBLEMS
TEST OPTIONS
REASON FOR QUESTION
Voltage test.
STE/ICE-R #89.
If 22 to 28 vdc are not present,
trailer blackout lights will not
operate.
2-20. ELECTRICAL SYSTEM TROUBLESHOOTING (CONT).
Tools and Special Tools
Tool Kit, General Mechanic’s: Automotive
(Item 74, Appendix G)
STE/ICE-R (optional) (Item 3, Appendix G)
Multimeter (Item 44, Appendix G)
Personnel Required
Two
Equipment Condition
Engine OFF, (TM 9-2320-364-10)
Parking brake applied, (TM 9-2320-364-10)
Wheels chocked, (TM 9-2320-364-10)
References
TM 9-2320-364-10
TM 9-2330-385-14
TM 9-4910-571-12&P
Are 22 to 28 vdc measured on
wire 1678C at connector
MC15, terminal F?
Go to Trailer
Troubleshooting
(TM 9-2330-385-14).
YES
WARNING
Read WARNING
on Page 2-1561
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