TM 5-3805-254-20-1
ORGANIZATIONAL TROUBLESHOOTING - CONTINUED’
MALFUNCTION
TEST OR INSPECTION
CORRECTIVE ACTION
21. BOTH BACKUP LIGHTS 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.
Step 1.
Remove instrument panel pad (page 2-424). Set multimeter to 20 vdc scale. Connect red test lead to
backup light circuit breaker terminal (1) and black test lead to ground. Rotate KEY SWITCH (2) clockwise
to on position. Check for 11 to 13 vdc on multimeter. Move red test lead to circuit breaker terminal (3).
Check for 11 to 13 vdc on multimeter. Rotate KEY SWITCH (2) counterclockwise to off position.
Disconnect test leads.
a.
If multimeter does not read 11 to 13 vdc, replace backup light circuit breaker (4)
(page 2-750).
b.
If multimeter reads 11 to 13 vdc, install instrument panel pad (page 2-424) and go
to step 2.
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