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 263 of 1176
TM 9-2320-361-24-1
0015 00
0015 00-7
HEATING SYSTEMS TROUBLESHOOTING (Contd)
MALFUNCTION
TEST OR INSPECTION
CORRECTIVE ACTION
2. HOT WATER
PERSONNEL HEATER
DOES NOT OPERATE
OR DOES
NOT OPERATE
IN LOW POSITION
Test 1. Check horn operation. Place
power accessory switch to the
ON position. Push horn button.
Test 2. Check heater high/low switch
for power input.
1. Set multimeter to a range that
will measure 24 VDC.
2. Disconnect lead 10 at rear of
heater switch.
3. Touch multimeter positive lead
to contact end of lead 10 at
heater switch.
4. Touch multimeter negative lead
to frame ground. Voltage
should be present.
Test 3. Test for power output at heater
high/low switch.
1. Set multimeter to a range that
will measure 24 VDC.
2. Reconnect lead 10
and
disconnect lead 400 at rear of
heater switch at the high
switch side. Place switch in the
high position.
3. Touch positive lead of multimeter
to contact end of power output
at the heater switch.
4. Touch multimeter negative lead
to frame ground. Voltage
should be present.
1. If horn fails to operate, go to
WP 0014 00, table 1,
malfunction 10.
2. If horn is operational, voltage is
present at input of heater circuit
breaker. Go to test 2.
3. If heater high/low switch operates
in high but fails to operate in low,
go to test 5.
1. If voltage is present, go to test 3.
2. If voltage is not present, repair or
replace lead 10 (WP 0090 00).
1. If voltage is present, go to test 4.
2. If voltage is not present, replace
heater switch (WP 0116 00).
Table 1. Heating Systems Troubleshooting Procedures (Contd).
TEST 2
STEPS 3
AND 4
TEST 3
STEPS 3
AND 4
HEATER
SWITCH
LEAD
400
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