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Page Title:
TRAILER BLACKOUT MARKER LIGHTS DO NOT ILLUMINATE (CONT) |
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 TM 9-2320-366-20-1
e68. TRAILER BLACKOUT MARKER LIGHTS DO NOT ILLUMINATE (CONT)
WARNING
Read WARNING
KNOWN INFO
TEST OPTIONS
on following page.
4.
Voltage Test or
Towing vehicle blackout marker
STE/ICE-R Test #89
lights OK.
Is 12 VDC present at relay
REASON FOR QUESTION
Circuit breaker CB42 OK.
K29 terminal 86 on PDP?
Trailer electrical system OK.
If 12 VDC is not present,
Rear lights cable assembly OK.
wire 1408 is faulty.
Rear intervehicular 24 VDC
(12 pin) cable.
POSSIBLE PROBLEMS
Faulty dashboard cable
NO
assembly.
Faulty relay K29.
Repair wire 1408 from relay K29 terminal 86 on
PDP to terminal board TB1 position 53 (para 2-45)
YES
or replace WTEC II dashboard cable assembly
(para 7-10) or WTEC III dashboard cable
assembly (para 7-11).
KNOWN INFO
TEST OPTIONS
5.
Continuity Test or
Towing vehicle blackout marker
STE/ICE-R Test #91
lights OK.
Is continuity present from
REASON FOR QUESTION
Circuit breaker CB42 OK.
relay K29 terminal 85 on
Trailer electrical system OK.
If continuity is not present,
PDP to ground?
Rear lights cable assembly OK.
wire 3040 is faulty.
Rear intervehicular 24 VDC
(12 pin) cable.
POSSIBLE PROBLEMS
Faulty dashboard cable
assembly.
NO
Faulty relay K29.
Repair wire 3040 from K29 terminal 85 on PDP
to terminal board TB2 position 20 (para 2-45) or
YES
replace WTEC II dashboard cable assembly
(para 7-10) or WTEC III dashboard cable
assembly ( para 7-11).
Replace relay K29 (para 7-9).
2-820
Change 1
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