TM 9-2330-213-14&P
MALFUNCTION
TEST OR inspection
CORRECTIVE ACTION
2.
ONE OR MORE LAMPS (BUT NOT ALL) FAIL TO LIGHT.
WARNING
When troubleshooting an electrical malfunction, ALWAYS disconnect Inter vehicular
electrlcal cable from towing vehicle. Failure to do so may result in injury or death
due to electric shock.
NOTE
Refer to paragraph 4-27 to determine routing of electrical wires and location of
electrical components.
Step 1.
Check affected lamps.
Step 2.
Check continuity between edge of lamp socket and frame.
If there is no continuity, remove and clean mating surfaces (para 4-21, 4-22, or 4-23).
Step 3.
Check continuity between center post of lamp socket and related light assembly plug connec-
tors.
If there is no continuity, replace affected light assembly (para 4-21, 4-22, or 4-23).
Step 4.
Check related chassis wiring harness plug connectors for presence of 24 volts.
If 24 volts are not present, proceed to step 5.
Check related inter vehicular cable plug connectors for presence of 24 volts.
Step 5.
If 24 volts are present, replace chassis wiring harness (para 4-24).
Check towing vehicle receptacle pin connector for presence of 24 volts.
Step 6.
If 24 volts are present, replace intervehicular cable (para 4-26).
If 24 volts are not present, refer to the towing vehicle unit maintenance manual.