TM 9-2330-227-14&P
ORGANIZATIONAL TROUBLESHOOTING - CONTINUED
MALFUNCTION
TEST OR INSPECTION
CORRECTIVE ACTION
2. ONE OR MORE, BUT NOT ALL LIGHTS WILL NOT WORK
Check tractor-to-semitrailer cable. Using multimeter set to read
Step 1.
voltage, put black probe on ground contact and red probe
on other contacts.
If multimeter measurement is not approximately 24-vdc on all contacts,
perform truck tractor troubleshooting.
Check semitrailer connector receptacle for bent, broken, or
Step 2.
dirty or corroded pins.
a. If pins are dirty or corroded, clean (page 3-8).
b. If pins are broken or there is any evidence of damage,
notify Direct Support Maintenance.
Check which lights do not work, and compare to Electrical
Step 3.
Schematic Diagram (page 4-78).
a. For inside domelights, notify Direct Support Maintenance.
b. If all lights on the same circuit are out, circuit
needs replacement. Notify Direct Support Maintenance.
Take door assembly off light assembly, pull lamp out of socket,
Step 4.
and check for corroded or damaged socket.
If lamp socket is corroded, clean; if damaged, replace (page 4-31).
Using multimeter set to read voltage, put red probe on socket contact
Step 5.
and black probe to good ground.
If multimeter measurement is approximately 24-vdc, replace
lamp (page 4-31).
Put door assembly back on light assembly. Light assembly may have to be
Step 6.
removed (page 4-31). Pull apart wire harness connector at inoperative
lamp noting band marker number. Using multimeter set to read voltage,
put red probe on wire harness terminal and black probe to good ground.
