TM 5-3805-254-20-1
ORGANIZATIONAL TROUBLESHOOTING - CONTINUED
MALFUNCTION
TEST OR INSPECTION
CORRECTIVE ACTION
22. ONE BACKUP LIGHT DOES NOT WORK - CONTINUED.
WARNING
Although KEY SWITCH must be on and battery ground cable connected to test electrical circuit
voltage, turn off KEY SWITCH and disconnect battery ground cable before doing resistance tests
or replacing parts. This will keep you from getting shocked and prevent damage to parts and
equipment.
NOTE
Scrape painted surfaces to bare metal before connecting test leads to ensure correct multimeter
readings.
Steps 3 and 4 are typical for both stoplight/taillight assemblies.
Step 3. Check each stoplight/taillight assembly (1) for looseness.
a. If stoplight/taillight assembly (1) is loose, tighten three nuts (2) using 7/16-inch box-end wrench
and go to step 4.
b. If stoplight/taillight assembly (1) is not loose, go to step 4.
Step 4. Set multimeter to ohms scale and adjust to 0 ohms. Connect red test lead to stud (3) on
stoplight/taillight assembly (1) and black test lead to bracket (4). Check for 0 ohms on multimeter.
Disconnect test leads.
a. If multimeter reads no continuity, unscrew and take off three nuts (2) and three lockwashers
(5) using 7/16-inch box-end wrench. Take stoplight/taillight assembly (1) off bracket (4).
Clean three studs (3) and mating surface (6) using wire brush. Put stoplight/taillight assembly
(1) on bracket (4).
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