TM 5-3805-254-20-1
ORGANIZATIONAL TROUBLESHOOTING - CONTINUED
MALFUNCTION
TEST OR INSPECTION
CORRECTIVE ACTION
29. ALL CAB MOUNTED MARKER 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). Using multimeter, set to 20 vdc
scale. Connect red test lead to circuit breaker wire 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, replace circuit
breaker (2)
(page 2-764).
b.
If multimeter reads 11 to 13 vdc, go to step 2.
Step 2.Install instrument panel pad (page 2-424). Using multimeter, set to 20 vdc
scale. Connect red test lead to 58 wire (3) on LIGHTS switch (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, 58 wire (3)
must be
replaced. Notify Direct Support Maintenance.
b.
If multimeter reads 11 to 13 vdc, go to step 3.
Step 3.Open upper center instrument panel (page 2-424). Using multimeter, set to 20
vdc scale. Connect red test lead to 58A wire (5) on LIGHTS switch (4) and black
test lead to ground. Put LIGHTS switch (4) in down position. Check for 11 to 13
vdc on multimeter. Put LIGHTS switch (4) in center position, and disconnect test
leads.
a.
If multimeter does not read 11 to 13 vdc, LIGHTS switch
(4) must be
replaced (page 2-725).
b.
If multimeter reads 11 to 13 vdc, go to step 4.
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