ELECTRICAL TROUBLESHOOTING - continued - TM-9-2320-386-24-1-10098

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

0012 00

Electrical Troubleshooting (Contd)

MALFUNCTION

TEST OR INSPECTION

CORRECTIVE ACTION

Step 2. Touch negative lead of multimeter to contact end of lead 33 at temperature transmitter.

Step 3. Touch positive lead of multimeter to contact end of lead 33 at temperature transmitter.

a. If continuity is not found, replace or repair lead 33 (WP 0125 00).

b. If continuity is found, replace temperature gauge (WP 0094 00).

END OF TESTING!

17. FUEL GAUGE INOPERATIVE

WARNING

Do not perform testing near fuel tank with fill cap or sending unit

removed. Fuel may ignite causing injury to personnel.

NOTE

Before performing test, ensure fuel tank is full.

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

Test 1. Test for battery voltage to fuel level sending unit.

Step 1. Disconnect lead 28 from fuel level sending unit.

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

Step 3. Connect negative lead to frame ground and touch positive lead to contact end of lead 28.

a. If battery voltage is present, go to test 2.

b. If battery voltage is not present, go to test 3.

Test 2. Test fuel gauge operation.

Step 1. Turn accessory/battery switch to OFF position.

Step 2. With lead 28 already disconnected from fuel level sending unit, touch contact end to

frame ground.

Step 3. Turn accessory/battery switch to ON position.

Step 4. Fuel gauge should read EMPTY.

a. If fuel gauge shows EMPTY, go to step 5.

b. If fuel gauge does not show EMPTY, replace fuel gauge (WP 0094 00).

Step 5. Lift lead 28 from frame ground. Fuel gauge should now read FULL.

a. If fuel gauge shows FULL, it is operational. Remove fuel level sending unit

(WP 0115 00) and go to test 5.

b. If fuel gauge does not show FULL, replace fuel gauge (WP 0094 00).

Test 3. Test fuel gauge voltage.

Perform malfunction 15, test 2.

Test 4. Test continuity of lead 28.

Step 1. Turn accessory/battery switch to OFF position.

Step 2. Disconnect lead 28 from fuel gauge and from fuel level sending unit.

Step 3. Connect jumper wire from fuel level sending unit end of lead 28 to frame ground.

Step 4. Set multimeter to measure continuity.

Step 5. Connect negative lead of multimeter to frame ground and touch positive lead of

multimeter to contact end of lead 28.

a. If continuity is found, reconnect lead 28 and recheck fuel gauge operation.