TM 5-3805-254-20-1
ORGANIZATIONAL TROUBLESHOOTING - CONTINUED
TM 5-3805-254-20-1
MALFUNCTION
TEST OR INSPECTION
CORRECTIVE ACTION
24. ONE HEADLIGHT DOES NOTWORK - 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
Srape painted surfaces to bare metal before connecting test leads to ensure correct multimeter readings.
Left side low-beam headlight wire is marked 53 and right side low-beam headlight wire is marked
53A.
Step 3. Unscrew and take off two wing screws (1) and junction box cover (2). Set multimeter to 20 vdc scale. Connect
red test lead to terminal (3) on junction box (4) and black test lead to ground. Have assistant push LIGHTS switch
handle (5) up to on position. Check for 11 to 13 vdc on multimeter. Have assistant push LIGHTS switch handle
(5) down to off position. Disconnect test leads.
If multimeter reads 11 to 13 vdc 53/53A wire (6) must be replaced. Notify Direct Support Maintenance.
Step 4. Test headlight (7) as follows: Remove headlight (page 2-807). Set Multimeter to ohms scale and adjust to 0
ohms. Connect red test lead to terminal (8) and black test lead to terminal (9). Check for 0 ohms on multimeter.
Move black test lead to terminal (10). Check for 0 ohms on multimeter. Disconnect test leads.
a. If multimeter read no continuity on terminals (9 or 10), replace headlight (7) (page 2-807).
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