TM 5-3805-262-20
3-11. LIGHT SYSTEMS TROUBLESHOOTING (CONT)
MALFUNCTION
TEST OR INSPECTION
CORRECTIVE ACTION
2. FLOOD LIGHTS DO NOT OPERATE (Cont).
S t e p 2 . ( C o n t ) .
a. If multimeter indicates 24 volts for both terminals, go to step
3 below.
b. If multimeter indicates zero for both terminals, check wiring
connection between flood light switch and vehicle lights switch
connector pin M. Repair or replace wire or connector as neces-
sary (page 5-168).
c. If multimeter indicates 24 volts at one terminal and zero at re-
maining terminal, remove right instrument panel (page 5-48) and
replace flood light switch (page 5-53).
Step 3.
Behind right instrument panel, connect multimeter between each ter-
minal of 10 ampere circuit breaker and cab sheet metal.
Check that multimeter indicates 24 volts for both terminals.
a .
b .
c .
If multimeter indicates 24 volts for both terminals, check
wiring connection between 10 ampere circuit breaker and flood
light. Repair or replace wire as necessary (page 5-168).
If multimeter indicates zero for both terminals, check wiring
connection between flood light switch and 10 ampere circuit
b r e a k e r. Repair or replace wire as necessary (page 5-168).
If multimeter indicates 24 volts at one terminal and zero at re-
maining terminal, remove right instrument panel (page 5-48) and
replace 10 ampere circuit breaker (page 5-53).
Step 4.
Disconnect wiring harness terminal from wire lead terminal of flood
light by grasping both terminals with your fingers and firmly pull-
ing them apart.
Connect multimeter between wiring harness terminal and chassis
frame.
Multimeter should indicate 24 volts.
a . I f m u l t i m e t e r i n d i c a t e s 2 4 v o l t s, replace lamp (page 5-92 or
5-102).
b. If multimeter indicates zero, check wiring connection between
flood light wiring harness terminal and 10 ampere circuit break-
er behind right instrument panel. Repair or replace wiring as
necessary (page 5-168).
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