e66. TRAILER BLACKOUT STOPLIGHTS DO NOT ILLUMINATE (CONT)
TM 9-2320-365-20-1
2-792 Change 1
KNOWN INFO
TEST OPTIONS
NO
YES
Continuity Test or
STE/ICE-R Test #91
REASON FOR QUESTION
2.
Go to step 6 of this fault.
CAUTION
Read CAUTION
on following page.
Is continuity present from
connector J130 socket F
to relay K27 terminal 87?
This question eliminates
possible problems and
determines where
troubleshooting continues.
TEST OPTIONS
KNOWN INFO
WARNING
Read WARNING
on following page.
Voltage Test or
STE/ICE-R Test #89
3.
POSSIBLE PROBLEMS
Is 24 VDC present at
relay K27 terminal 30
on PDP?
Towing vehicle blackout
stoplights OK.
Circuit breaker CB39 OK.
Trailer electrical system OK.
Rear lights cable assembly OK.
Rear intervehicular 24 VDC
(12 pin) cable OK.
REASON FOR QUESTION
If 24 VDC is not present,
wire 1959 is faulty.
NO
Repair wire 1959 from K27 terminal 30 on
PDP to circuit breaker CB39 terminal 4
(para 2-40) or replace WTEC II dashboard
cable assembly (para 7-10) or WTEC III
dashboard cable assembly (para 7-11).
YES
Faulty dashboard cable
assembly.
Faulty relay K27.
POSSIBLE PROBLEMS
Towing vehicle blackout
stoplights OK.
Circuit breaker CB39 OK.
Trailer electrical system OK.
Faulty dashboard cable
assembly.
Faulty relay K27.
Faulty rear lights cable
assembly.
Faulty rear intervehicular
24 VDC (12 pin) cable.
