ELECTRICAL TROUBLESHOOTING - continued - TM-9-2320-386-24-1-10097

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

0012 00

Electrical Troubleshooting (Contd)

MALFUNCTION

TEST OR INSPECTION

CORRECTIVE ACTION

Step 5. Disconnect lead 27 from temperature gauge.

Step 6. Use multimeter or 24-volt test lamp to check voltage on contact end of lead 27 at

temperature gauge.

a. Place positive lead on contact end of lead 27.

b. Place negative lead on frame ground.

c. If battery voltage is present, go to malfunction 11. Set multimeter to measure

continuity.

Step 8. Check continuity of lead 27.

a. Disconnect lead 27 from front wiring harness.

b. If continuity is not present, replace or repair lead 27 (WP 0125 00).

END OF TESTING!

16. ENGINE TEMPERATURE GAUGE INOPERATIVE

NOTE

If STE/ICE-R is available, perform NG31 Gauge Test

Test 1. Test coolant temperature gauge operation.

Step 1. Disconnect lead 33 from coolant temperature sending unit.

Step 2. Turn accessory/battery switch to ON position.

Step 3. Coolant temperature gauge should read MINIMUM temperature.

Step 4. Touch contact end of lead 33 to frame ground. Coolant temperature gauge should read

MAXIMUM temperature.

Step 5. If coolant temperature gauge operates properly, go to test 3 and check temperature

sending unit.

Step 6. If coolant temperature gauge does not operate properly, go to test 2.

Test 2. Test for battery voltage into temperature gauge (malfunction 15, test 2).

Test 3. Test temperature sending unit.

Step 1. Allow coolant to cool.

Step 2. Set multimeter to measure continuity.

.WARNING.

Hearing protection is required for the driver and co-driver. Hearing

protection is also required for all personnel working in and around this

vehicle while the engine is running (Reference AR 40-5 and TB MED. 501).

Step 3. Start engine (TM 9-2320-386-10).

Step 4. Connect multimeter negative lead to engine ground and positive lead to temperature

sending unit. Multimeter reading should decrease as engine coolant temperature

increases.

a. If resistance does not show any decrease as temperature increases, replace

temperature transmitter (WP 0114 00).

b. If resistance does show a decrease as temperature increases, go to test 4.

Test 4. Check continuity of lead 33.

Step 1. Disconnect lead 33 from temperature gauge.