TM 9-2330-231-14&P
ORGANIZATIONAL TROUBLESHOOTING
MALFUNCTION
TEST OR INSPECTION
CORRECTIVE ACTION
ELECTRICAL SYSTEM
1. ONE OR MORE LAMPS FAIL TO LIGHT.
Step 1.
Check lamps.
Remove and replace as required:
Service taillight (page 4-21).
Composite light (page 4-18).
Blackout light (page 4-16).
Marker light (page 4-24).
Step 2.
Check for continuity between edge of lamp socket and light assembly housing,
and center post of lamp socket and related light assembly plug connector.
If no continuity exists, replace light assembly:
Service taillight (page 4-22).
Composite light (page 4-20).
Blackout light (page 4-17).
Marker light (page 4-24).
Step 3.
Check continuity between edge of lamp socket and trailer frame.
If no continuity exists, remove and clean mating surfaces.
Step 4.
Disconnect main harness from intervehicular cable. Have assistant operate
lights while checking voltage in affected lines of intervehicular cable.
If 24 volts are present in all affected lines, replace main harness
Step 5.
Disconnect intervehicular cable from towing vehicle receptacle. Have assistant
operate light while checking voltage at towing vehicle receptacle.
If voltage is present at all sockets of towing vehicle receptacle, replace
intervehicular cable.
If voltage is not present at all sockets of towing vehicle receptacle,
reference applicable maintenance TM for the vehicle.
2. LAMPS DIM OR FLICKERING.
Step 1.
Check continuity between intervehicular cable pin D and ground wire eyelet end.
If no continuity exists, replace intervehicular cable.
Step 2.
Check continuity between ground wire eyelet end and trailer frame.
If no continuity exists, remove eyelet and clean mating surfaces.
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