TM-9-2320-272-23-1
TRUCK, 5-TON, 6X6, M939, M939A1, AND M939A2 SERIES TRUCKS (DIESEL)
TECHNICAL MANUAL; FIELD MAINTENANCE MANUAL; VOLUME 1 OF 5
SEPTEMBER 2012
TM-9-2320-272-23-1 - Page 819 of 1313
STOPLIGHT INOPERATIVE (SERVICE OR BLACKOUT) - Continued
STEP
1.
ARE BULBS IN GOOD CONDITION?
a.
Replace non-operating stoplight bulb with one known to be operative (Volume 2, WP
0327).
T1024DAA
Figure 1.
Light Bulbs.
b.
Start engine and run to build air supply to normal operating pressure.
NOTE
•
For stoplight circuit test, air pressure must be maintained at operating pressure and
brake pedal must be depressed.
•
If all stoplights operates, bulb was faulty.
c.
Press brake pedal.
d.
Check if all stoplights operates.
CONDITION/INDICATION
ARE BULBS IN GOOD CONDITION?
DECISION
NO - Go to Step (12) to verify problem is solved.
YES - Go to Step (2).
STEP
2.
ARE SOCKETS AND TERMINALS CLEAN AND IN GOOD CONDITION?
a.
Place battery switch to OFF position.
T1025DAA
Figure 2.
Light Socket.
TM 9-2320-272-23-1
0095
0095-2
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