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 840 of 1313
INDIVIDUAL LIGHTS DO NOT LIGHT WITH DIRECTIONAL SIGNAL LEVER IN ANY POSITION - Continued
T0777DAA
VOM
REAR
COMPOSITE
LIGHT
REAR
COMPOSITE
LIGHT
CONTROL
UNIT
FLASHER
FRONT
COMPOSITE
LIGHT
FRONT
COMPOSITE
LIGHT
LIGHT SWITCH
STOP TURN
POSITION
HAZARD WARNING
POSITION
Figure 2.
Directional Signal Circuit Test.
j.
Connect multimeter red lead to disconnected wire. Refer to point to point schematics.
k.
Connect multimeter black lead to a known good ground.
l.
Meter reading should cycle from 0 to greater than 18 VDC at a rate of 1 to 2 cycles per second.
CONDITION/INDICATION
DOES BATTERY VOLTAGE CYCLE ON AND OFF AT CONNECTOR OF LAMP THAT DOES NOT
ILLUMINATE?
DECISION
NO - Go to Step (3).
YES - Clean light socket and install lamp. Go to Step (5) to verify problem is solved.
TM 9-2320-272-23-1
0097
0097-3
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