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 839 of 1313
INDIVIDUAL LIGHTS DO NOT LIGHT WITH DIRECTIONAL SIGNAL LEVER IN ANY POSITION - Continued
STEP
1.
IS LAMP IN GOOD OPERATING CONDITION?
T1031DAA
Figure 1.
Light Bulbs.
a.
Replace non-operating signal bulb with one known to be operative (Volume 2, WP
0327).
b.
Place battery switch to ON position.
c.
Place main lighting switch in STOP TURN position.
d.
Place directional signal control lever to HAZARD warning position.
NOTE
If all turn signal lights flash, bulb is faulty.
e.
Check if stop signal lamps flash.
CONDITION/INDICATION
IS LAMP IN GOOD OPERATING CONDITION?
DECISION
NO - Signal lamp bulb was faulty. Go to Step (5) to verify problem is solved.
YES - Go to Step (2).
STEP
2.
DOES BATTERY VOLTAGE CYCLE ON AND OFF AT CONNECTOR OF LAMP THAT DOES NOT
ILLUMINATE?
a.
Place battery switch to OFF position.
b.
If right front turn signal not illuminating, disconnect wire 461 at right front composite light.
c.
If left front turn signal not illuminating, disconnect wire 460 at left front composite light.
d.
If right rear turn signal not illuminating, disconnect wire 22-461 at right rear composite light.
e.
If left rear turn signal not illuminating, disconnect wire 21-460 at left rear composite light.
f.
Place battery switch to ON position.
g.
Place main lighting switch in STOP TURN position.
h.
Place directional signal control lever to HAZARD warning position.
i.
Set up multimeter to measure VDC.
TM 9-2320-272-23-1
0097
0097-2
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