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 270 of 1176

TM 9-2320-361-24-1

0015 00

0015 00-14

HEATING SYSTEMS TROUBLESHOOTING (Contd)

Table 1. Heating Systems Troubleshooting Procedures (Contd).

MALFUNCTION

TEST OR INSPECTION

CORRECTIVE ACTION

4. HEATER CONTROL

BOX LIGHT

INOPERATIVE, BUT

HEATER OPERATIVE

Test 1. Check for voltage at heater

control box indicator lamp.

1. Set multimeter to a voltage

range that will measure

24 VDC.

2. Position heater control switch

to RUN.

3. Position heater switch to HIGH.

4. Remove heater control box

indicator lamp.

5. Touch positive lead of

multimeter to indicator lamp

socket.

6. Touch negative lead of

multimeter to frame ground.

Test 2. Check for voltage between

personnel heater and heater

control box.

1. Disconnect wiring harness

behind personnel heater

control box.

2. Connect jumper wire from pin

D to pin E at personnel

heater.

1. If voltage is present, replace

indicator lamp.

2. If voltage is not present, go to

test 2.

1. If heater control box indicator lamp

is lit, replace personnel heater

(WP 0351 00).

2. If indicator lamp fails to light,

repair or replace wiring harness

(WP 0090 00).

END OF WORK PACKAGE

INDICATOR

LAMP

HEATER

CONTROL BOX

PERSONNEL

HEATER

TEST 1

STEPS 5

AND 6

HARNESS

CONNECTOR