TM 5-3805-262-20
3-11. LIGHT SYSTEMS TROUBLESHOOTING (CONT)
MALFUNCTION
TEST OR INSPECTION
CORRECTIVE ACTION
9. VOLT METER LIGHT OR INSTRUMENT CLUSTER GAGE LIGHTS DO NOT OPERATE (Cont).
Step 2. Place cab dome light switch in on position.
a. If cab dome light is on, go to step 3 below.
b. If cab dome light is off, go to step 4 below.
Step 3.
Reach behind right instrument panel and connect multimeter between
each terminal of 15 ohm resistor and cab, sheet metal.
Multimeter should indicate at least 5 volts for both terminals.
a . I f m u l t i m e t e r i n d i c a t e s a t l e a s t 5
check gray wire connection from 15
cluster connector pin 8. Repair or
as necessary (page 5-168).
v o l t s f o r b o t h t e r m i n a l s,
ohm resistor to instrument
replace wiring or connector
b. If multimeter indicates zero for both terminals, check gray wire
connection from 15 ohm resistor to dimmer compartment lights
c o n t r o l . R e p a i r o r r e p l a c e w i r i n g o r t e r m i n a l a s n e c e s s a r y ( p a g e
5-168) .
c. If multimeter indicates at least 5 volts at one terminal and
zero at remaining terminal, remove right instrument panel (page
5-48) and replace 15 ohm resistor (page 5-53).
Step 4. Place vehicle lights switch in PANEL BRT position.
Cab dome light should be on.
a. If cab dome light is not on, go to step 5 below.
b. If cab dome light is on, remove right instrument panel (page
5-48) and replace vehicle lights switch (page 5-53).
Step 5. Reach beneath right instrument panel and connect multimeter between
each terminal of dimmer compartment lights control and cab sheet
m e t a l .
Multimeter should indicate 24 volts for both terminals.
a .
If multimeter indicates 24 volts for both terminals, check
w i r i n g c o n n e c t i o n f r o m d i m m e r c o m p a r t m e n t l i g h t s c o n t r o l t o 15
ohm resistor and cab dome light. Repair or replace wiring or
terminals as necessary (page 5-168, 5-184, 5-188, or 5-192).
3-91
