TM 5-3805-262-20
3-11. LIGHT SYSTEMS TROUBLESHOOTING (CONT)
MALFUNCTION
TEST OR INSPECTION
CORRECTIVE ACTION
7. BLACKOUT STOP LIGHTS DO NOT OPERATE.
Step 1 .
Start and operate engine until air pressure gage indicates in green
area, then shut down engine.
Place ignition key switch in on position.
Place vehicle lights switch in B.0. DRIVE position.
Tell assistant to press brake treadle and valve.
Blackout stop lights and driving light should be on .
a. If one stop light is on, go to step 5 below.
b. If both stop lights are off and driving light is on, go to step
2 below.
c. If all blackout lights are off, refer to page 3-81, MALFUNCTION
1.
Step 2. Place vehicle lights switch in SER DRIVE position.
Tell assistant to press brake treadle and valve.
Service stop lights should be on.
a. If one stop light is on, refer to page 3-88, MALFUNCTION 8.
b. If both stop lights are off, go to step 3 below.
Step 3. Unlock and open front access door.
Connect a short jumper wire across stop light switch terminals at
bottom of brake treadle and valve.
Service stop lights should
be on.
Place vehicle
in B.0. DRIVE
Blackout stop
be on.
l i g h t s s w i t ch
p o s i t i o n.
l i g h t s s h o u ld
a .
b .
If at least one stop
l i g h t i s o n , r e p l a ce
double check valve and
stop light switch (page
7-66) .
I f a l l s t o p l i g h t s a re
off, remove jumper wire
and go to step 4 below.
3-87
