TEST OPTIONS
REASON FOR QUESTION
KNOWN INFO
Voltage Test or
STE/ICE-R Test #89
POSSIBLE PROBLEMS
WARNING
Read WARNING
on following page.
4.
Faulty dashboard cable
assembly.
Faulty relay K27.
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.
e66. TRAILER BLACKOUT STOPLIGHTS DO NOT ILLUMINATE (CONT)
TM 9-2320-365-20-1
2-794 Change 1
Is 12 VDC present at relay
K27 terminal 86 on PDP?
If 12 VDC is not present, wire
23 is faulty.
NO
Repair wire 23 from relay K27
terminal 86 on PDP to connector
PX15 socket N (para 2-40) or replace
WTEC II dashboard cable assembly
(para 7-10) or WTEC III dashboard
cable assembly (para 7-11).
YES
Replace relay K27
(para 7-9).
YES
If continuity is not present,
wire 3044 is faulty.
REASON FOR QUESTION
Continuity Test or
STE/ICE-R Test #91
TEST OPTIONS
Repair wire 3044 from K27 terminal 85
on PDP to terminal board TB2 position
34 (para 2-40) or replace WTEC II
dashboard cable assembly (para 7-10)
or WTEC III dashboard cable assembly
( para 7-11).
NO
Is continuity present from
relay K27 terminal 85 on
PDP to ground?
5.
KNOWN INFO
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.
POSSIBLE PROBLEMS
Faulty dashboard cable
assembly.
Faulty relay K27.
