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 821 of 1313
STOPLIGHT INOPERATIVE (SERVICE OR BLACKOUT) - Continued
STEP
4.
IS THERE VOLTAGE AT STOPLIGHT SWITCH?
a.
Place battery switch to OFF position.
T0762DAA
Figure 4.
Stoplight Switch.
b.
Disconnect both circuit 75 wires at stoplight switch.
c.
Place battery switch to ON position.
d.
Set up multimeter to measure VDC.
e.
Connect multimeter black lead to good ground.
f.
Connect multimeter red lead to both circuit 75 wires, one at a time. Refer to point to point schematics.
g.
Meter reading should be greater than 18 VDC for at one of the wires. Note reading.
CONDITION/INDICATION
IS THERE VOLTAGE AT STOPLIGHT SWITCH?
DECISION
NO - Go to Step (5).
YES - Go to Step (8).
TM 9-2320-272-23-1
0095
0095-4
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