TM 9-2330-235-14&P
Table 4-2. Organizational Troubleshooting (Con't).
MALFUNCTION
TEST OR INSPECTION
CORRECTIVE ACTION
Step 3. Check lights for proper grounding.
Remove lights (para 4-10 or 4-11). Clean screws and mounting brackets. Install lights and tighten
screws securely.
Step 4. Check lamps or LEDs.
3.
ONE OR MORE LAMPS (BUT NOT ALL) FAIL TO LIGHT.
WARNING
When troubleshooting an electrical malfunction, ALWAYS disconnect intervehicular cable from towing
vehicle. Failure to do so may result In Injury or death due to electric shock.
NOTE
Refer to paragraph 4-16 to determine routing of electrical wires and location of electrical components.
Step 1. Check lamps or LEDs.
Step 2. Check continuity between edge of lamp socket and light assembly housing, and center post of lamp socket
and related light assembly plug connector.
Step 3. Check continuity between edge of lamp socket and trailer frame.
If no continuity exists, remove and clean mating surfaces.
Step 4. Disconnect chassis wiring harness from intervehicular cable. While assistant operates lights, check voltage
in affected lines of intervehicular cable.
If 24 volts are present in all affected lines of intervehicular cable, replace chassis wiring harness (para 4-12 or
4-13).
Step 5. Disconnect intervehicular cable from towing vehicle receptacle. While assistant operates lights, check
voltage at towing vehicle receptacle.
If voltage is present at all sockets of towing vehicle receptacle, replace intervehicular cable (para 4-14 or 4-
15).
If voltage is not present at all sockets of towing vehicle receptacle, troubleshoot towing vehicle electrical
system. Refer to towing vehicle technical manual.
4-9