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 850 of 1313
NO LIGHTS OPERATE WITH DIRECTIONAL SIGNAL CONTROL LEVER IN ANY POSITION - Continued
STEP
7.
IS THERE CONTINUITY BETWEEN TERMINAL C OF THE FLASHER UNIT AND GROUND?
a.
Connect multimeter red lead to terminal C of the flasher unit. Refer to point to point schematics.
T1032DAA
VOM
2
2
3
A
B
C
H
F
1
1
CONTROL
UNIT CABLE
FLASHER
UNIT CABLE
Figure 7.
Flasher Wire Harness Test.
b.
Connect multimeter black lead to a known good ground.
c.
Meter reading should be less than 20 ohms.
CONDITION/INDICATION
IS THERE CONTINUITY BETWEEN TERMINAL C OF THE FLASHER UNIT AND GROUND?
DECISION
NO - Repair faulty wire (Volume 3, WP
0352). Go to Step (9) to verify problem is solved.
YES - Go to Step (8).
STEP
8.
IS YOUR ORIGINAL PROBLEM STILL PRESENT AFTER REPLACING FLASHER UNIT?
a.
Replace flasher unit (Volume 2, WP
0318).
b.
Ensure vehicle is returned to normal operating condition.
c.
Check to see if your original problem still exists.
CONDITION/INDICATION
IS YOUR ORIGINAL PROBLEM STILL PRESENT AFTER REPLACING FLASHER UNIT?
DECISION
YES - Perform System Operates Incorrectly In One Or More Posiitions Of Directional Signal Control Lever
troubleshooting (WP
0099).
NO - Problem fixed.
TM 9-2320-272-23-1
0098
0098-7
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