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 920 of 1313
HORN INOPERATIVE - Continued
STEP
4.
DOES HORN SOLENOID HAVE BATTERY VOLTAGE?
a.
Check for battery voltage at horn solenoid.
b.
Place battery switch to the OFF position.
c.
Refer to point to point schematics.
T0101DAA
25
26
Figure 4.
Horn Solenoid Test.
d.
Reconnect circuit 26 wire to circuit breaker.
e.
Disconnect circuit 26 wire from horn solenoid.
f.
Place battery switch to ON position.
g.
Connect multimeter red lead to disconnected circuit 26 wire.
h.
Connect multimeter lack lead to vehicle chassis ground.
i.
Meter reading should be greater than or equal to 18 VDC.
CONDITION/INDICATION
DOES HORN SOLENOID HAVE BATTERY VOLTAGE?
DECISION
YES - Go to Step (5).
NO - Repair or replace circuit 26 wire (Volume 3, WP
0352). Go to Step (7) to verify problem is solved.
TM 9-2320-272-23-1
0109
0109-5
Back to Top
