TM 5-3805-254-20-1
ORGANIZATIONAL TROUBLESHOOTING - CONTINUED
MALFUNCTION
TEST OR INSPECTION
CORRECTIVE ACTION
50.
INSTRUMENT PANEL LAMPS 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.Open upper center instrument panel (page 2-424). Set multimeter to 20 vdc scale. Put
LIGHTS switch (1) in up position and rotate DOMEIPNL light switch (2) to full bright position.
Connect red test lead to wire terminal (3) and black test lead to ground. Check for 11 to 13 vdc
on multimeter. Put LIGHTS switch (1) in center position. 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 3.
Step 2.Remove instrument panel pad (page 2-424). Set multimeter to 20 vdc scale. Connect red
test lead to circuit breaker wire terminal (4) 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, replace circuit
breaker (5) (page 2-760).
b.
If multimeter reads 11 to 13 vdc, 68 wire (6) must be
replaced. Notify Direct Support
Maintenance.
Step 3.Set multimeter to 20 vdc scale. Put LIGHTS switch (1) in up position. Connect red test
lead to wire terminal (7) and black test lead to ground. Check for 11 to 13 vdc on multimeter. Put
LIGHTS switch (1) in center position. Disconnect test leads.
a.
If multimeter does not read 11 to 13 vdc, LIGHTS switch
(8) must be replaced (page
2-725).
b.
If multimeter reads 11 to 13 vdc, go to step 4.
2-300
