ELECTRICAL TROUBLESHOOTING - continued - TM-9-2320-386-24-1-10106

TM 9-2320-386-24-1-1

0012 00

Electrical Troubleshooting (Contd)

MALFUNCTION

TEST OR INSPECTION

CORRECTIVE ACTION

Test 2. Test for power output at heater high/low switch.

Step 1. Set multimeter to range that will measure 24 Vdc.

Step 2. Disconnect lead 400A at rear of heater switch.

Step 3. Touch positive lead of multimeter to contact end of power output at the heater switch.

Step 4. Touch negative lead of multimeter to frame ground. Voltage should be present.

a. If voltage is present, go to test 3.

b. If voltage is not present, replace heater switch (WP 0243 00).

Test 3. Test personnel heater for power input.

Step 1. Ensure heater switch is in HIGH position.

Step 2. Set multimeter to a range that will measure 24 Vdc.

Step 3. Disconnect lead 400A from personnel heater.

Step 4. Touch multimeter positive lead to contact end of lead 400A.

Step 5. Touch multimeter negative lead to frame ground. Voltage should be present.

a. If voltage is not present, replace or repair lead 400A (WP 0125 00).

b. If voltage is present, and personnel heater fails to operate, replace personnel heater

END OF TESTING!

27. PERSONNEL FUEL BURNING/POWER PLANT HEATER INOPERATIVE

Test 1. Test lead 10 for power input to heater control box.

Step 1. Set multimeter to a range that will measure 24 Vdc.

Step 2. Disconnect lead 10 from heater control box.

Step 3. Touch multimeter positive lead to contact end of lead 10.

Step 4. Touch negative lead of multimeter to frame ground. Voltage should be present.

a. If voltage is present, go to test 3.

b. If voltage is not present, replace or repair lead 10 (WP 0125 00).

Test 2. Check heater control box for power output.

Step 1. Set multimeter to a range that will measure 24 Vdc.

Step 2. Disconnect harness connector from rear of control box.

Step 3. Set heater control switch to START and hold.

Step 4. Set heater control heat switch to HIGH.

Step 5. Touch positive lead of multimeter to pin A.

Step 6. Touch negative lead of multimeter to frame ground.

Step 7. Repeat steps 5 and 6 for pins B, C, and D. Voltage should be present.

a. If voltage is present at all pins tested, go to test 4.

b. If voltage is not present at one or more pins, replace heater control box

Test 3. Check for input power at fuel pump.

Step 1. Set multimeter to a range that will measure 24 Vdc.

Step 2. Disconnect lead 25 from fuel pump.