TM-9-2320-361-24-1
2-1/2 TON, 6X6, M44A2 SERIES TRUCKS
TECHNICAL MANUAL; FIELD AND SUSTAINMENT MAINTENANCE PART 1 OF 2
AUGUST 2006
TM-9-2320-361-24-1 - Page 254 of 1176
TM 9-2320-361-24-1
0014 00
0014 00-18
INDICATORS, GAUGES, AND WARNING SYSTEM TROUBLESHOOTING (Contd)
Table 1. Indicator, Gauges, and Warning System Troubleshooting (Contd).
MALFUNCTION
TEST OR INSPECTION
CORRECTIVE ACTION
10. HORN DOES NOT
OPERATE
NOTE
Troubleshooting of the electrical horn
and air horn are the same.
Test 1. Test input voltage to horn
circuit breaker.
1. Turn main light switch to
SERVICE DRIVE position.
2. Remove lead 25 from circuit
horn breaker.
3. Set multimeter to a voltage
range that will measure
24 VDC.
4. Connect negative lead to
frame ground.
5. Touch positive lead to horn
circuit breaker contact.
Test 2. Test air horn solenoid.
1. Remove lead 25 from pin B of
air horn solenoid.
2. Connect negative lead of
multimeter to frame ground.
3. Touch positive lead to pin B of
solenoid.
4. Remove lead 25 connected to
pin A of air horn solenoid.
Connect negative lead to
frame ground. Touch positive
lead to contact end of lead 25.
Test 3. Test horn switch input
voltage.
1. Remove horn button
(WP 0113 00) until lead 25
can be seen.
2. Set multimeter to a voltage
range that will measure 24 VDC.
3. Connect negative lead to
frame ground.
4. Touch positive lead to lead 25
contact end.
1. If voltage is not present, replace
horn circuit breaker.
2. If voltage is present, go to test 2.
1. If voltage is present, go to test 3.
2. If voltage is not present, go to
step 4.
1. If voltage is present, replace air
horn solenoid (WP 0114 00).
2. If voltage is not present, repair or
replace lead 25.
1. If voltage is not present, repair or
replace lead 25 (WP 0090 00).
2. If voltage is present, go to test 4.
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