TM 5-3805-254-20-1
ORGANIZATIONAL TROUBLESHOOTING - CONTINUED
MALFUNCTION
TEST OR INSPECTION
CORRECTIVE ACTION
23. BOTH HEADLIGHTS DO NOT WORK.
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 2 thru 23 apply to malfunction of both hi beams and both low beams.
Steps 24, 25, and 26 apply to malfunction of both hi beams.
Steps 27, 28, and 29 apply to malfunction of both low beams.
Step 1. Remove instrument panel pad (page 2-424). Set multimeter to 20 vdc scale. Connect red test lead to
circuit breaker terminal (1) and black test lead to ground. Check for 11 to 13 vdc on multimeter.
Disconnect test leads.
a. If multimeter does not read 11 to 13 vdc, go to step 2.
b. If multimeter reads 11 to 13 vdc, go to step 15.
Step 2. Check nut (2) on circuit breaker terminal (1) for looseness.
a. If nut (2) is loose, disconnect batteries (page 2-424) and tighten nut (2) using 3/8-inch open-
end wrench. Connect batteries (page 2-424) and go to step 3.
b. If nut (2) is not loose, go to step 3.
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