TM 5-3805-254-20-1
ORGANIZATIONAL TROUBLESHOOTING - CONTINUED
MALFUNCTION
TEST OR INSPECTION
CORRECTIVE ACTION
46.
DOME LIGHT DOES 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 circuit breaker output stud (1) and black test lead to ground. Rotate KEY SWITCH (2)
clockwise to on position and 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, go to step 3.
b.
If multimeter reads 11 to 13 vdc, go to step 2.
Step 2.Set multimeter to 20 vdc scale. Connect red test lead to 63 wire (3) 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, 63 wire (3) must be replaced. Notify Direct
Support maintenance.
b.
If multimeter reads 11 to 13 vdc, go to step 3.
Step 3.Test dome light base (4) as follows: Using 3/16-inch flat-tip screwdriver, pry off dome light
lens (5). Set multimeter to 20 vdc scale. Connect red test lead to socket end (6) and black test
lead to ground. Rotate DOME/PNL light switch (7) until click is felt. Check for 11 to 13 vdc on
multimeter. Rotate DOME/PNL light switch (7) to dim position. Disconnect test leads.
a.If multimeter does not read 11 to 13 vdc, 63A wire (8) must be replaced. Notify
Direct Support maintenance.
b.
If multimeter reads 11 to 13 vdc, go to step 4.
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