TEST OPTIONS
REASON FOR QUESTION
KNOWN INFO
Voltage Test or
STE/ICE-R Test #89
POSSIBLE PROBLEMS
YES
WARNING
Read WARNING
on following page.
4.
e65. TRAILER BLACKOUT MARKER LIGHTS DO NOT ILLUMINATE (CONT)
TM 9-2320-365-20-1
2-784 Change 1
If 12 VDC is not present,
wire 1408 is faulty.
Is 12 VDC present at relay
K29 terminal 86 on PDP?
Repair wire 1408 from relay K29 terminal
86 on PDP to terminal board TB1 position
53 (para 2-40) or replace WTEC II dashboard
cable assembly (para 7-10) or WTEC III
dashboard cable assembly (para 7-11).
Towing vehicle blackout
marker lights OK.
Circuit breaker CB42 OK.
Trailer electrical system OK.
Rear lights cable assembly OK.
Rear intervehicular 24 VDC
(12 pin) cable OK.
Faulty dashboard cable
assembly.
Faulty relay K29.
NO
KNOWN INFO
Towing vehicle blackout
marker lights OK.
Circuit breaker CB42 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 K29.
TEST OPTIONS
Continuity Test or
STE/ICE-R Test #91
REASON FOR QUESTION
If continuity is not present,
wire 3040 is faulty.
5.
Is continuity present from
relay K29 terminal 85 on
PDP to ground?
NO
Repair wire 3040 from K29 terminal
85 on PDP to terminal board TB2
position 20 (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 K29
(para 7-9).
