ELECTRICAL TROUBLESHOOTING - continued - TM-9-2320-386-24-1-10107

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

0012 00

Electrical Troubleshooting (Contd)

MALFUNCTION

TEST OR INSPECTION

CORRECTIVE ACTION

Step 3. Touch multimeter negative lead to contact end of lead 25.

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

a. If voltage is present, replace personnel fuel burning heater (WP 0247 00).

b. If voltage is not present, replace or repair lead 25 (WP 0125 00).

Test 4. Check fuel pump for proper operation.

Refer to WP 0009 00, Mechanical Troubleshooting, malfunction 48.

Test 6. Check for power input at personnel heater.

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

Step 2. Disconnect harness connector at personnel heater.

Step 3. Set heater control switch to RUN.

Step 4. Touch multimeter positive lead to pin A of harness connector.

Step 5. Touch multimeter negative lead to frame ground.

Step 6. Repeat steps 4 and 5 for pins B, C, and D. Voltage should be present at all pins tested.

a. If voltage is present, replace personnel fuel burning heater (WP 0247 00).

b. If voltage is not present at one or more pins, replace or repair harness

END OF TESTING!

28. HEATER CONTROL BOX LIGHT INOPERATIVE, BUT HEATER OPERATIVE

Test 1. Check for voltage at heater control box indicator lamp.

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

Step 2. Position heater control switch to RUN.

Step 3. Position heater switch to HIGH.

Step 4. Remove heater control box indicator lamp.

Step 5. Touch positive lead of multimeter to indicator lamp socket.

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

a. If voltage is present, replace indicator lamp.

b. If voltage is not present, go to test 2.

Test 2. Check for voltage between personnel heater and heater control box.

Step 1. Disconnect wiring harness at personnel heater.

Step 2. Connect jumper wire from pin D to pin E at personnel heater.

a. If heater control box indicator lamp is lit, replace personnel fuel burning heater

b. If indicator lamp fails to light, replace or repair wiring harness (WP 0125 00).

END OF TESTING!

END OF WORK PACKAGE

0012 00-24