TM 5-3805-262-20
3-11. LIGHT SYSTEMS TROUBLESHOOTING (CONT)
MALFUNCTION
TEST OR INSPECTION
CORRECTIVE ACTION
7. BLACKOUT STOP LIGHTS DO NOT OPERATE (Cont).
Step 4.
Place vehicle lights and ignition key switches in off position.
Reach behind right instrument panel and unplug vehicle lights switch
connector by turning connector nut counterclockwise and pulling
f i r m l y.
Check wiring connection between wiring harness pink-white wire ter-
minals at blackout stop and tail lights and vehicle lights switch
connector pin N.
a. Repair or replace wiring or connector as necessary (page 5-168
or 5-179) .
b. If wiring and connectors are okay, remove right instrument panel
(page 5-48) and replace vehicle lights switch (page 5-53) .
Step 5.
Disconnect wiring harness pink-white wire terminal from tail light
wire terminal by grasping both terminals with your fingers and firm-
ly pulling them apart.
Connect multimeter between wiring harness terminal and chassis
frame.
Tell assistant to press brake treadle and valve.
Multimeter should indicate 24 volts.
a. If multimeter indicates 24 volts, connect terminals by grasping
both terminals with your fingers, alining, and firmly pushing
them together. Then replace lamp (page 5-109). If stop light
still does not operate, replace blackout stop and tail light
assembly (page 5-109).
b. If multimeter indicates zero, check wiring connection at pink-
white wire terminal. Repair or replace wiring or terminal as
necessary (page 5-179).
8. SERVICE 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 SER DRIVE position.
Tell assistant to press brake treadle and valve.
Service stop lights and driving lights should be
a. If one stop light is on, go to step 4 below.
b. If both stop lights are off and at least one
on, go to step 2 below.
on.
d r i v i n g l i g h t is
3-88
