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 918 of 1313
HORN INOPERATIVE - Continued
T0099DAA
10
26
Figure 2.
Horn Circuit Breaker.
c.
Place battery switch to the OFF position.
d.
Disconnect circuit 10 wire from circuit breaker.
e.
Place battery switch to ON position.
f.
Set multimeter to measure VDC.
g.
Connect multimeter red lead to disconnected circuit 10 wire.
h.
Connect multimeter black lead to vehicle chassis ground.
i.
Meter reading should be greater than or equal to 18 VDC.
CONDITION/INDICATION
DOES HORN CIRCUIT BREAKER HAVE PROPER INPUT VOLTAGE?
DECISION
YES - Go to Step (3).
NO - Repair or replace circuit 10 wire (Volume 3, WP
0352). Go to Step (7) to verify problem is solved.
TM 9-2320-272-23-1
0109
0109-3
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