TM 9-2320-273-20
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Table 5-11. Stop and Turn Signal Lamps Circuit Troubleshooting.
INSTRUCTION
INDICATION
YES
NO
NOTE
If any single lamp does not operate, try replacing
the lamp bulb first. Likewise, if lamps in different
circuits fail, replace the lamp bulbs first. When
replacing any lamp bulb, clean the socket contacts
and check for a good ground. If a lamp bulb is not
the problem, proceed as follows. Be sure the
ignition key switch is ON when checking the stop
or park functions.
TURN SIGNALS INOPERATIVE.
Jumper across the
terminals of the flash-
er (P to L).
Check circuit wiring
and circuit breaker,
using multimeter.
Check for voltage at
turn signal control
connector.
If the stop lamps work
but the rear direction-
als do not, replace the
directionals control.
Lamp lights.
12 volts dc nominal.
12 volts dc nominal.
STOPLAMPS ARE INOPERATIVE.
If the turn signals work
but the stop lamps do
not, check for voltage
on both terminals of
the stoplamp switch
while the brake pedal
is being depressed.
Check circuit 25
wiring.
Replace
flasher.
Go to Step
3.
Replace
control
(para 5-58).
Go to
Step 2.
Repair/
replace.
Repair
wiring.
NOTE
Air pressure must be normal for the stoplamps
to operate.
12 volts dc nominal.
Go to
Checking
Step 2.
wiring to
switch, then
replace
switch
(para 5-85).
REMARKS
5-53
